In which one of the following sentences is the apostrophe used correctly?

The correct answer would be C. THis is because if it is written as (it's) it is a contraction for (it is).

the choice that is not a technique that you should use to come up with ideas for the topic of a research project is, writing about academic subjects that are not interesting to you. this does not belong to the techniques to come up with ideas because having no interest in a certain topic will lose your drive to come up with better ideas. it gives no room for improvement and acquiring of new ideas and information. 

explanation:

answer; /// the above statement is (true);