Answer:
C. parecen
Explanation:
The sentence translates to "Juanita _____ the works of that poet are interesting."
The only reasonable answer would be "thinks" no?
"le parecen" in Spanish means that, so parecen is your answer.
** I did also want to add that it's also parecen because it's referring to "las obras" which is plural. That means that the verb (parecen) must be plural as well.
