During the Civil War, Harriet Tubman was
A-a nurse on the battlefield.
B-a spy for the Confederacy.
C-a railroad employee.
D-a spy for the Union.

D- A spy for the Union

Explanation:

(I just took the test on Edge and got 100%.)

But also, using what we have learned, we know that Harriet Tubman supported the abolition of slavery. During the Civil War, she was not helping in the Underground railroad, nor was she supporting the Confederacy so that eliminates B and C. And since Harriet Tubman had been navigating the Underground Railroad many times previously, she knew the land well, so it would only make sense if she was a spy for the Union. She even recruited a group of former slaves to hunt for rebel camps and report on Confederation action.

b) the confederacy had to pay all union war expenses.