[求助]885 section7-7

7.     While Jackie Robinson was a Brooklyn Dodger, his courage in the face of physical threats and verbal attacks was not unlike that of Rosa Parks, who refused to move to the back of a bus in Montgomery, Alabama.

(A) not unlike that of Rosa Parks, who refused

(B) not unlike Rosa Parks, who refused

(C) like Rosa Parks and her refusal

(D) like that of Rosa Parks for refusing（A）

(E) as that of Rosa Parks, who refused

答案A，D呢？为什么一定用双重否定not unlike，直接用like不是更简洁？