In an outline, one of these entries is a main topic and three are subtopics. which is the main topic?

Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be "Darwin's methods," since this is the "umbrella" under which the other topics lie. 

comparative method

hope this : )

answer; /// i believe the three where,tutankhamun,hatshepsut and , im not sure,but maybe (ramses the great)