Figure of speech
its a saying actually "that was just a figure of speech"
You can't kill a wolves mate.
I think the answer is B. Answer choice C is unprofessional. Answer choice D goes off topic and shouldn't be included in the thesis. Answer choice A is based, it has options in it. When you are writing a research report, you want to have facts only, not your opinion. Hope that helps.
The answer is a. It reveals character personality details. Without you would feel more distant from the character.
Answer:
the study of music enhances a student's academic performance