Final answer:
The Battle of Fort Sumter led to Lee joining the southern army as most slavery states seceded from the Union.
correct answer is A
Step-by-step explanation:
The Battle of Fort Sumter had several consequences on the southern side.
One of these consequences was that Lee joined the southern army.
However, it's important to note that this occurred as all but four slavery states seceded from the Union. This decision by Lee and the secession of most slavery states were direct results of the attack on Fort Sumter.
correct answer is A