Question

read the excerpt from a vindication of the rights of woman
let there be then no coercion established in society, and the common law of gravity prevailing, the sexes will fall into their proper places. and, now that more equitable laws are forming your citizens, marriage may become more sacred: your young men may choose wives from motives of affection, and your maidens allow love to root out vanity.
what is the central idea of the excerpt?
in equal roles, men and women will establish more meaningful marriages.
men and women should marry for reasons other than love and affection.
in proper societies, there are strict laws about marriage.
men will fall into submission when their wives are well educated.

Explanation:

The text emphasizes that without coercion (equal roles as no coercion implies equality in a sense) and with more equitable laws, marriage can be more sacred. Men choosing wives from motives of affection (meaningful aspect) and maidens letting love root out vanity (also contributing to a more meaningful marriage context) support the idea of more meaningful marriages when in equal - role situations. The other options: "Men and women should marry for reasons other than love and affection" is contrary to "young men may choose wives from motives of affection". "In proper societies, there are strict laws about marriage" - the text focuses on equitable laws leading to better marriage (sacredness from affection - based choices) not strict laws. "Men will fall into submission when their wives are well - educated" is not mentioned in the text.

Answer:

In equal roles, men and women will establish more meaningful marriages.