Frank is an employee at the HBF Corporation, and he has recently been terminated because of poor company income. Frank visits the company’s blog and saw a comment from his manager, which says, "We had to let Frank go today because he kept screwing up sales order. He’s incompetent!" This is an example of which one of the following?
A. Termination evidence
B. Slander
C. Libel
D. Freedom of speech