单项选择题

听力原文:M: Can I leave now, professor?
W: OK, Tom. But remember to focus more on your work, or you'll fail your final exam.
What's the relationship between the two speakers?
A.Husband and wifE.
B.Professor and student.
C.Neighbors.

A.What's
B.Husband
C.
B.Professor
D.
C.Neighbors.