![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-53/ti_inject-812ce.png)
Why does the professor say this:
A.
He is trying to get the students to pay attention.
B.
He is correcting something that he said earlier in the lecture.
C.
He is beginning a summary of the important points.
D.
He is joking with the students about the lecture.