TPO6lec2第一题答案是否有误？？

whostheoneUID: 3379777

我这看到的答案是AB

what topic related to the Nightcap Oak does the professor mainly discuss(choose 2)
A  factors that relate to the size of the area in which it grows
B  the size of its population over the last few centuries
C  whether anything can be cone to ensure its survival
D  why it did not change much over the last one hundred million years

看了半天都不认为A是主旨
求解答

whostheoneUID: 3379777