Commas should not be used
a. to convey contrast.
b. after yes or no in answering a question.
c. to explain a specific statement.
d. following interjections.

The correct answer is C, to explain a specific statement. A is incorrect because commas can be used to convey contrast.

His shirt was red, while his pants were blue.

B is incorrect because 'yes' and 'no' are technically interjections, so they can be separated from the rest of a sentence by a comma.

Yes, that is the correct answer.

D is incorrect because, as mentioned above, interjections are often separated from the rest of the sentence by a comma or an exclamation mark.

Oh, I see.

Hope this helps!