Which logical fallacy is used in the text?
My dentist recommends this toothpaste brand, but I'm reluctant to take the advice of someone with such bad taste. He has truly ugly art on the office walls, and the upholstery in his waiting room is atrocious.
A. hasty generalization: a broad claim based on too few observations
B. appeal to nature: the assumption that natural things are always good
C. ad hominem: an attack against the person making the argument, rather than the argument itself
Answer with the option's letter from the given choices directly.

C