20. Willy: Did you hear that Dr. Jane Goodall (珍古德博士) passed away last year?
Joan: It's so sad. She spent her whole life studying chimpanzees in Africa.
Willy: Yes. _______ So now we know better how chimpanzees behave in the wild.

(A) She put a lot of effort into protecting the oceans.

(B) She really helped people understand these animals.

(C) She gave so much love to the poor children in Africa.

(D) She truly encouraged people to take care of stray cats.