I believe it is C, because is says something they both want, and the question is asking for a comparison.
A critic is someone who expresses a reasoned opinion on ny matter, especially involving a judgement on it’s quality, truthfulness, beauty or tehnique.
A cynic is a captious, fault -finding critic, often holding a belief that human conduct is always motivated by self-interest.
Answer:
a study by researchers published on a university website
a book written by a scholar on the topic
Explanation:
These two resources come from credible professionals.