Why Could Someone Argue That the North Was Complicit in the Expansion

Multiple Choice

Why could someone argue that the North was complicit in the expansion of slavery?

A) Many northern states had slaves at one time.
B) Some slaves ran away to northern states.
C) Some slaveholders were originally from the North.
D) Most in the North wanted to reopen the importation of slaves.
E) Northern factory demand for cotton steadily increased.