People tend to evaluate female leaders slightly less favorably than male leaders because:

A) women aren't as skilled at leading people.
B) they tend to rely on gender stereotypes and prototypes of leaders.
C) people don't have many examples of women in leadership roles.
D) women tend to use one leadership style whereas effective leaders use many styles.
E) of all of these reasons.

Research has shown that people tend to evaluate female leaders less favorably than male leaders because they rely on gender stereotypes and prototypes of leaders, often associating leadership qualities with traditional masculine traits. It is not because women are not as skilled at leading people or because they use one leadership style. While lack of examples of women in leadership roles may contribute to this bias, it is not the sole reason.