Options A, B, and D.
There's a likely chance that C can also be true (They decide taxes), but I decided to leave it out because exporting is usually led by privately owned companies.
Answer:
Because they are everywhere
Explanation:
They are literally everywhere
Confederate troops fired on Fort Sumter in South Carolina's Charleston Harbor. Less than 34 hours later, Union forces surrendered. Traditionally, this event has been used to mark the beginning of the Civil War. So the second one.