The best answer would be "Both a and b."
The American Revolution enabled women to take on public roles usually reserved for men, as they took on new responsibilities during the war, and they were given more responsibilities that proved their value in society. While the Revolution was an important step towards women's rights and later movements for suffrage, it did not directly allow women to fight for suffrage at that time. Thus, both a and b capture the significance of the Revolution for women more accurately.