Which of the following might be an excerpt from a speech that relies on logos for its persuasive power?

a. "it clearly follows from those premises that the only logical answer is to raise taxes."
b. "i've had it up to here with taxes, taxes, and more taxes! hey, give us a break, right? "
c. "take my word for it; in my position as city treasurer, i know how to handle the tax crisis we're facing now."