As a Result of the Union Defeat in the Peninsula

As a result of the Union defeat in the Peninsula Campaign,

A) Lincoln named George McClellan commander of the Union forces.
B) the North decided to fight a war of containment.
C) Lincoln began to draft the Emancipation Proclamation.
D) Lincoln decided that they key to the war was controlling the Mississippi River.
E) the Union commanders were left without an overall military strategy.