Which statement best completes this diagram? Cause

Robert E. Lee's forces
attack Union troops in
the Seven Days' Battles.

Effect

A. The Union
gives control
of the border
states to the
Confederacy.
B. The Confederacy stops the Union from capturing its capital city.
C. The Union encourages former slaves to join its armed forces.
D. The Confederacy captures all of the Union's ironclad ships.
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