Research (Twenge, 2001) Found That Women's Self-Ratings of Assertiveness Mirrored

Research (Twenge, 2001) found that women's self-ratings of assertiveness mirrored the opportunities for women that were available socially, becoming more assertive during those times when women's roles were more independent and less assertive when women's roles became more dependent. According to the text, the "take-home" message of this finding is that

A) the social roles that people play can influence their personalities.
B) people's personalities determine the social roles they are willing to assume.
C) women are becoming more dominant than men.
D) women are becoming more independent.