Which of the following is the closest in meaning to "To be meaningful, a conversation should head in a general direction. "? （）

Which of the following is the closest in meaning to "To be meaningful, a conversation should head in a general direction. "? （）

A.A meaningful conversation should cover most topics.

B.A meaningful conversation should include some common topics.

C.A meaningful conversation should embody some purposes.

D.A predetermined point should be reached during a conversation.

正确答案是C