![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Sometimes what really annoys the presenters?
A.
The introduction part at the beginning of a conference session.
B.
The question-and-answer period of a conference session.
C.
The rude interruption made by audiences.
D.
The questions that the presenter cannot answer.