Which statement best describes the relationship between the southern secession and the Battle of Fort Sumter?

A
While the Battle of Fort Sumter signaled that conflict was unavoidable, it was southern secession that truly started the war.
B
While the southern secession signaled that conflict was unavoidable, it was the Battle of Fort Sumter that truly started the war.
C
It is unknown when the Civil War technically started, as fighting occurred in Kansas all the way back in 1857 over states’ rights to enforce slavery.
D
If federal troops had not fled to Fort Sumter just after South Carolina seceded, then none of the other 10 southern states would have seceded.