AP English Language

The correct definition of commentary is: C.Explains to the reader why and how the quotes and paraphrases that were used help prove the claim to be true.

Explanation:

Commentary is the part of your writing where you interpret, analyze, and explain how the evidence (such as quotes or paraphrases) supports your central argument or claim. It's the reasoning behind why the evidence is relevant and how it strengthens your point. Without commentary, the evidence alone would lack context and explanation.