![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Listen again to part of the lecture. Then answer the question. Why does the professor ask this:
A.
To test the students' understanding of plate tectonics
B.
To describe an event that confuses many scientists
C.
To point out a theory that has never been confirmed
D.
To introduce a phenomenon that he intends to explain