Woman: Mr. Longs briefing seemed to go on forever. I was barely able to stay awake. Man: H

Woman: Mr. Longs briefing seemed to go on forever. I was barely able to stay awake. Man: How could you sleep through that？ It was very important to the mission we are going to carry out. Question: What does the man imply？

A．Mr. Long"s briefing was unnecessarily long.

B．The woman should have been more attentive.

C．Mr. Long"s briefing was not relevant to the mission.

D．The woman needn"t have attended the briefing.

请帮忙给出正确答案和分析，谢谢！