Final answer:
The conflict theory is best equipped to explain the topic of the film American History X, which explores learning hatred and the relationship between a neo-Nazi skinhead and his younger brother.
Step-by-step explanation:
The best theory to explain the topic of the film American History X, which explores the theme of learning hatred, is the conflict theory. Conflict theory focuses on the power disparities and struggles between different racial and ethnic groups. It examines the conflicts that arise when the dominant group perceives a threat from a minority group. In the film, the relationship between the neo-Nazi skinhead and his younger brother, along with the exploration of racism and discrimination, aligns with the concepts of conflict theory.