Final answer:
Feminist debates and writings in the 1960s and 70s were pivotal in changing marriage dynamics, particularly by emphasizing the shared responsibility of housework between men and women, thereby challenging traditional gender roles.
Step-by-step explanation:
Feminist debates and writings in the 1960s and 1970s contributed to changing the rules of marriage by emphasizing that both women and men were morally and legally responsible for housework, arguing for the legal entitlement of contraceptives for sexually active women, and insisting that women should have the choice to be employed full-time. Part of the shift included discrediting myths about women's capabilities and insisting on gender equality in various facets of life, such as employment and education. This period saw significant developments, such as the publication of Betty Friedan's The Feminine Mystique and the increased participation of women in the workforce. However, the answer to the multiple-choice question is A: emphasizing that both women and men were morally and legally responsible for housework and had to negotiate who would do what. Although feminist movements touched upon various aspects of equality, the specifics of B and C are not universally representative of the movement's aims and achievements during that era, and hence, D (All of the above) is not the correct answer.