After Assuming Command of the Army of the Potomac, General

After assuming command of the Army of the Potomac, General George McClellan made the mistake of

A) taking too many strategic and tactical risks that endangered his troops.
B) relying on Lincoln's military judgment.
C) being unconcerned about the morale of his troops.
D) not drilling his troops enough to prepare them for battle.
E) consistently believing that the enemy outnumbered him.