One long-term effect of the Seneca Falls Convention was that it established Lucretia Mott as an activist.
made it easier to fight for women's rights.
O showed that women could protest effectively.
helped married women gain special privileges.

I believe its B!

Explanation:

The Seneca Falls Convention a women's rights convention and the very first one to be made in the United States! in July 1848 in Seneca Falls, New York, the meeting launched the women's suffrage movement, which more than seven decades later ensured women the right to vote.

i think the answer is b.