Which of the following is an imperative sentence？A．I look forward to meeting you in the ne

Which of the following is an imperative sentence？

A．I look forward to meeting you in the next session.

B．I wish that you can stay for another three days.

C．Whatever you do, you should not forget who you are.

D．Keep running or you will fall behind.

请帮忙给出正确答案和分析，谢谢！