Which sentence exemplifies the logical fallacy "poisoning the well"?

A) Don't ask my friend to help you plan for the party; she has terrible taste in music.
B)If we don't elect Mrs. Smith to the senate, we will definitely see a rise in taxes.
C) My dentist doesn't believe in taking vitamins, so I don't take them either.
D)We never had any crime until Mr. Jones was elected to office, so it's definitely his fault.