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.
The setting of "Marigolds" is during the depression or the 30s. You know this because the story says, "The depression that gripped the nation was no new thing to us" and "the black workers of rural Maryland had always been depressed".