Answer:
D. by insisting that women have better morals than men
Explanation:
Wollstonecraft's argument mainly states that women must have more responsibilites rather than being wive or performing any of the chores, Wollstonecraft wanted women to be involved in constitution. Hence he put the pont that by institing that women have better morals than men.
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The word "felicity" here means a sense of satisfaction, almost catharsis, as the speaker has found closure in his prayer and happiness.