How did Harriet Beecher Stowe help oppose the practice of enslavement?
A. by writing a powerful book, Uncle Tom's Cabin, which showed the evils of enslavement
B. by donating money to abolitionist newspapers which strongly opposed enslavement
C. by organizing religious revivals against the religious leaders who had not opposed enslavement
D. by writing "Civil Disobedience," an essay that described ways to undermine enslavers