Please be serious. I am not _______. You should consider it care

Please be serious. I am not _______. You should consider it carefully.
A、sorting
B、joking
C、counting
D、comparing
【正确答案】：B
【题目解析】：joke开玩笑。句意：请认真的。我不是在开玩笑。你应该仔细考虑一下。