Confederate Batteries Fired on Fort Sumter When They Learned That

Confederate batteries fired on Fort Sumter when they learned that

A) Lincoln had ordered the fort reinforced with federal troops.
B) Lincoln had ordered supplies sent to the fort.
C) the Union commander was planning to evacuate his troops secretly from the fort.
D) Lincoln had called for seventy-five thousand volunteers for the Union army.
E) southern support for secession was weakening.