1. is in correct because this paragraph does not refer to strength of mice.(There are only winner and loser.) 3. is incorrect because the word "overall" goes too much. 4. is not correct either.The sentence itself maybe correct, but it is not the result of the reserch.(I am even not sure if I can say an apple consists of a fruit.) So 2. is the answer imo.
出願期間 1/5〜1/22
試験日 2/18
合格発表 2/24