Which of the following statements is INCORRECT about punctuality in delivering speeches？A．

Which of the following statements is INCORRECT about punctuality in delivering speeches？

A．Always begin to deliver the speech on time.

B．If some audiences are late, repeat the important points.

C．Only mention the key points if time is going to run out.

D．Have a clock at hand to know the ending time clearly.

请帮忙给出正确答案和分析，谢谢！