Foreign Officials Pressured Congress to Mediate the Crisis Triggered by the Fugitive

Foreign officials pressured Congress to mediate the crisis triggered by the Fugitive Slave Act of 1850 on the basis

A) of the sheer violence of the institution of slavery.
B) of the bad publicity enforcement of the act generated.
C) of the fact that no other powerful nation supported slavery.
D) that exploitation of slave labor gave the United States an economic advantage over other countries.