Select the most appropriate option that can substitute the highlighted segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.
I had only my class notes for which I had to prepare for my examination.

Correct option is C

The correct substitution is (c) with which I had to.
Explanation:
· The phrase “for which I had to prepare” is incorrect.
· We prepare with notes, not for them.
· The correct preposition is "with": with which I had to prepare
Grammatical rule used:
· Relative pronoun with appropriate preposition: notes → with which
· Example: These are the tools with which I fixed the machine.