The answer is B. Clarence Thomas.
A reason for inhibitibg woman suffrage was the abolitionist movement becoming dominant and the Civil War plus WWI getting in the way and taking away attention.
Not to mention the Populists and the Progressives taking political action as well.
When Lincoln was elected as President, it was clear to slaveowners that there would be efforts to abolish slavery. White southerners who did not own slaves had nothing to lose, therefore southern slaveowners worried their loyalty would sway towards the anti-slavery movement. This would be detrimental to slaveowners as they would not only have Northerners trying to take away their slaves, but their fellow neighbours as well.
Hope this helped!