![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-53/ti_inject-812ce.png)
Which one(s) are correct statements about main idea?
A.
The main idea is overall and general.
B.
It's usually an assertion by the author.
C.
The main idea of a paragraph is often found in the topic sentence of that paragraph.
D.
The main idea of an essay is called the theme or thesis, which is the generalized message of all the topic sentences in that essay.