Which factor contributed most to the beginning of the women's-rights movement in the United States during the mid-1800s?

A dramatic increase in women's participation in the workforce
A shift in social attitudes brought on by increased sectional tensions
The experience of gender discrimination within reform movements
The granting of voting rights to African American men

Question

Which factor contributed most to the beginning of the women's-rights movement in the United States during the mid-1800s?

 A dramatic increase in women's participation in the workforce
 A shift in social attitudes brought on by increased sectional tensions
 The experience of gender discrimination within reform movements
 The granting of voting rights to African American men