What Did Anti-Slavery Northerners Come to Fear About Expansionist Southerners

Multiple Choice

What did anti-slavery northerners come to fear about expansionist southerners?

A) They were conspiring to make the Caribbean a slave empire.
B) The South would annex Cuba and make it a slaveholding region.
C) The South intended to bring slaves to the new western territories, despite the various compromises that had been struck.
D) The South would start a war over slavery.
E) None of these choices