The rule about subjects joined by 'and' is that there must be a subject-verb agreement. This means that if the subject is singular, then the verb must be also singular. On the other hand, if the subject is plural that means the verb must also be plural.
C. The lovers are in love with the right person because of magic, but they still need Theseus to approve of their plans to marry.
I'm not quite sure, but it's either A or C.
I think it would be A.
Hope this helps.
(Please mark this brainliest, I would really appreciate it) Thanks!