non-flammable will replace inflammable because –
inflammable (Adj.) : liable to catch fire easily
non-flammable (Adj.) : not likely to burn easily
Look at the examples given below :
We should always use clothes that are non-flammable.
These gases are highly inflammable.
Hence, non-inflammable clothing is the right usage

Correct Option: B

non-flammable will replace inflammable because –
inflammable (Adj.) : liable to catch fire easily
non-flammable (Adj.) : not likely to burn easily
Look at the examples given below :
We should always use clothes that are non-flammable.
These gases are highly inflammable.
Hence, non-inflammable clothing is the right usage

from will be used before chicken pox because –
Suffer (Verb) is followed by from (Prep.)
Look at the examples given below :
He suffers from asthma. ( )
He suffers asthma. (×)
Hence, Adults suffering from chicken pox is the right usage

Correct Option: A

from will be used before chicken pox because –
Suffer (Verb) is followed by from (Prep.)
Look at the examples given below :
He suffers from asthma. ( )
He suffers asthma. (×)
Hence, Adults suffering from chicken pox is the right usage

to put his signature will replace to put his sign because –
sign (Noun) an indication
Look at the examples given below :
I was asked to sign the letter.
There was no sign of his returning from Bangalore.
Hence, to put his signature is the right usage

Correct Option: B

to put his signature will replace to put his sign because –
sign (Noun) an indication
Look at the examples given below :
I was asked to sign the letter.
There was no sign of his returning from Bangalore.
Hence, to put his signature is the right usage

foreword will replace forward because –
a foreword, is a short introduction at the beginning of a book written by somebody other than the author.
Look at the examples given below :
He was asked to write a foreword for her book.
They ran forward to welcome her.
Hence, to write a fore word is the right usage

Correct Option: B

foreword will replace forward because –
a foreword, is a short introduction at the beginning of a book written by somebody other than the author.
Look at the examples given below :
He was asked to write a foreword for her book.
They ran forward to welcome her.
Hence, to write a fore word is the right usage

among will replace between because –
between is used when only two persons or things are involved.
among expresses a relationship when more than two persons/things are involved.
Look at the examples given below :
She had to choose between work and her family.
He divided his money among his brothers and sisters.
Hence, among the four girls is the right usage

Correct Option: C

among will replace between because –
between is used when only two persons or things are involved.
among expresses a relationship when more than two persons/things are involved.
Look at the examples given below :
She had to choose between work and her family.
He divided his money among his brothers and sisters.
Hence, among the four girls is the right usage