Test analysis: When answering questions, we should carefully distinguish the subtle differences between the content of the options and the content of the original literature, and then make judgments by memorizing some allusions and inferring according to the statements. Exclusion can be used. (1) "benevolence" can be associated with Mencius' "benevolent policy"; (2) Zhuangzi can be associated with "butterfly in my dream" and "carefree travel"; Lv Buwei can be associated with "Confucianism with awl mouth". So choose item a.