Question

select the part of the subject that agrees with the bold verb. the elephant that loves peanuts always winks at reverend lovejoy.

Explanation:

In the sentence "The elephant that loves peanuts always winks at Reverend Lovejoy", the verb "winks" agrees with the main subject "the elephant". The relative - clause "that loves peanuts" is just additional information about the elephant.

Answer:

the elephant