During the Writing of the Constitution in 1787 Some States

During the writing of the Constitution in 1787 some states had already abolished slavery while other states had large slave populations. Concerning slavery, the new U.S. Constitution

A) allowed it in southern states and upheld its abolition in northern states.
B) left the issue for the courts to decide.
C) reaffirmed its use as legitimate in the United States.
D) said nothing about either preserving or outlawing slavery.
E) called for its abolition.