There are no "shown" because you didn't give us anything, nobody can help without resources for questions like this!
The answer would be <span>B) One of my sister's friends that she made in her college sorority are a doctor.
The subject-verb error occurs in the words made and are. Made indicates a past-tense event, while are indicates the present-tense. To fix the sentence, you could change are to is.
</span>One of my sister's friends that she made in her college sorority is a doctor.