一道托福听力题,谁能帮我选下并解释下...

一道托福听力题,谁能帮我选下并解释下...
A:We've been assigned chapters five and six for next Tuesday.
B:At this rate,we'll never finish the text by the end of the semester.
What does B mean?
(A) The teacher assigns too much homework.
(B) She and the man are behind in their reading.
(C) The class isn't covering very much material.
(D) The semester ends next Tuesday.
A和B一男一女.