The first one is correct because There're is shorter for There are and "There are a good answer to that question" doesn't sound correct right? Whereas the first one There's is short for There is so "There is a good answer to that question" Now that sounds grammatically correct right?
I think maybe C? Not sure though, so don't take my word as gospel :)
He talks to beelzebub .........
Answer:
option a
To persuade <u>is </u><em><u>right </u></em><em><u>answer</u></em>