criteria will be used in place of criterion because–
criteria (Noun) is the Plural of criterion
Hence, a number of criteria is the right usage

Correct Option: B

criteria will be used in place of criterion because–
criteria (Noun) is the Plural of criterion
Hence, a number of criteria is the right usage

Use of on is incorrect.
Last Sunday will replace On last Sunday

Correct Option: A

Use of on is incorrect.
Last Sunday will replace On last Sunday

poetry/poems will replace poetries because –
poetry (Uncountable Noun) : a collection of poems poetry is both Singular and Plural.
Hence, the poems/ the poetry is the right usage

Correct Option: B

poetry/poems will replace poetries because –
poetry (Uncountable Noun) : a collection of poems poetry is both Singular and Plural.
Hence, the poems/ the poetry is the right usage

will will not be used.
Unless means the same as if ___ not.
Look at the examples given below :
You will be sick if you don’t stop eating.
You’ll be sick unless you stop eating.
Parallel Verbs are not used in the Conditional Clauses
Hence, you study hard is the right usage

Correct Option: B

will will not be used.
Unless means the same as if ___ not.
Look at the examples given below :
You will be sick if you don’t stop eating.
You’ll be sick unless you stop eating.
Parallel Verbs are not used in the Conditional Clauses
Hence, you study hard is the right usage

to/be will replace as.
The sentence will be –
He thinks himself to be a great scholar.

Correct Option: C

to/be will replace as.
The sentence will be –
He thinks himself to be a great scholar.