The correct answer is B. The movement for women's rights received less attention at the time because many people were more  interested and involved in the slavery issue.
Explanation:
The passage explains the issue of slavery and the struggle for abolition prevailed over women's movement and any other movement of the time. This is stated in "Women's suffrage ... were swallowed up by the single issue of slavery and  its abolition." Moreover, the author explains due to the importance of the abolition over women's suffrage, abolition occurred before women were given the right to vote. In this context, abolitIon and women's right are related because women's right received less attention during the time as the focus was on abolition (option B.)