Which of the following statements is true about feminism?

A) It is defined as the belief that men do not understand women.
B) It is defined as the belief that sisterhood is more important than any other relationship.
C) It is be defined most simply as a movement to end sexism and sexist oppression.
D) All of these answers are correct.

Feminism is defined as a movement to end sexism and sexist oppression. While there are different beliefs and interpretations within feminism, this is the most basic and widely accepted definition. Option A is not accurate as feminism is not about men not understanding women, but about challenging and dismantling patriarchal systems that oppress women. Option B is a form of feminism known as "radical feminism" that emphasizes women's relationships with each other, but is not the only or defining aspect of feminism.