Answer: B. their keen interest in voting for candidates who were opposed to slavery
Step-by-step explanation:
Lucretia Mott and Elizabeth Cady Stanton were at the forefront at the Seneca Falls Convention in 1848, which laid the foundation of the Feminist Movement in the United States.
The two activists had met years before organizing the Convention, at London's World Anti Slavery Convention in 1840. Both of them were fighting against slavery and other social justice issues, but they were very frustrated that, as women, they weren't granted the right to vote and they felt they had no power in decision making. They instantly clicked and they became great friends and the leaders of the future movement for women's rights.
In conclusion, their interest in women having more saying in public mattters and the abolition of slavery led to their powerful collaboration. The Senecca Fall Convention that they organized gave birth to women's suffrage movement.