personnel will replace personal because –
personnel (Noun) is used for people employed by or active in an organization, a business, or service
personal (Adj.) is related to a particular person
Look at the examples given below :
This is my personal opinion.
We have advertised for extra security personnel.
Personnel is a Plural Noun.
Hence, was carrying some army personnel is the right usage.

Correct Option: C

personnel will replace personal because –
personnel (Noun) is used for people employed by or active in an organization, a business, or service
personal (Adj.) is related to a particular person
Look at the examples given below :
This is my personal opinion.
We have advertised for extra security personnel.
Personnel is a Plural Noun.
Hence, was carrying some army personnel is the right usage.

ascent will replace assent because –
ascent (Noun) : an upward slope; the process/act of going upward but
assent (Noun) : to express agreement or acceptance, as of a proposal
Look at the examples given below :
The director has given her assent to the proposals.
The cart began its gradual ascent up the hill.
Hence, found the ascent of the mountain is the right usage.

Correct Option: B

ascent will replace assent because –
ascent (Noun) : an upward slope; the process/act of going upward but
assent (Noun) : to express agreement or acceptance, as of a proposal
Look at the examples given below :
The director has given her assent to the proposals.
The cart began its gradual ascent up the hill.
Hence, found the ascent of the mountain is the right usage.

the will be used before worst comes to the worst will replace comes to worst because –
worst (Adj.) is the Superlative Degree of bad (Positive Degree) and worse (comparative Degree) and the (Def. Art.) is used with a Superlative Degree.
if the worst comes to the worst (Idiom) :
if the situation becomes too difficult or dangerous.
Look at the examples given below :
If the worst comes to the worst, we’ll just have to sell the house.
If the worst comes to the worst, we’ll have to give them our bed and sleep on the floor.

Correct Option: B

the will be used before worst comes to the worst will replace comes to worst because –
worst (Adj.) is the Superlative Degree of bad (Positive Degree) and worse (comparative Degree) and the (Def. Art.) is used with a Superlative Degree.
if the worst comes to the worst (Idiom) :
if the situation becomes too difficult or dangerous.
Look at the examples given below :
If the worst comes to the worst, we’ll just have to sell the house.
If the worst comes to the worst, we’ll have to give them our bed and sleep on the floor.

principal will replace principle because –
principle (Noun) : a general rule that someone’s behaviour or idea is based on
Principal (Adj.) : a chief/important person/thing
Look at the examples given below :
His principal interest in life was money.
We follow the principle that everyone should be treated equally.
Hence, analyse thoroughly the principal causes is the right usage

Correct Option: B

principal will replace principle because –
principle (Noun) : a general rule that someone’s behaviour or idea is based on
Principal (Adj.) : a chief/important person/thing
Look at the examples given below :
His principal interest in life was money.
We follow the principle that everyone should be treated equally.
Hence, analyse thoroughly the principal causes is the right usage

furniture will replace furnitures because –
furniture is an Uncountable Noun.
It is not used in the Plural.
Look at the examples given below :
We are going to get new furniture for the living room. ( )
We are going to get new furnitures for the living room.(×)
Hence, and the teak-wood furniture of Dutch design is the right usage.

Correct Option: C

furniture will replace furnitures because –
furniture is an Uncountable Noun.
It is not used in the Plural.
Look at the examples given below :
We are going to get new furniture for the living room. ( )
We are going to get new furnitures for the living room.(×)
Hence, and the teak-wood furniture of Dutch design is the right usage.