Why Was the Fugitive Slave Law of 1793 Considered a Danger

Why was the Fugitive Slave Law of 1793 considered a danger to free blacks?

A) White masters could have fugitive slaves shot upon sight-and frequently did.
B) The federal government, for the first time, demonstrated that it supported slavery.
C) Any black northerner, under the law, could be kidnapped and forced into slavery.
D) Most never worried about the law; it was rarely enforced or used.