Answer:
c. "Jones pled guilty to a violation of campaign contribution laws"
Explanation:
A defamation constitutes false statement of fact that exposes a person to damages in the form of hatred, ridicule, or contempt, or causes loss to his business.
In the above statement, a false statement is made against Jones which could highly damage Jones's reputation. Notice also that it is specific as it a refers to "Jones" unlike the other options in the question.