I see that the answer choices provided are:
- O a nurse on the battlefield.
- O a spy for the Confederacy.
- O a railroad employee.
- O a spy for the Union.
During the Civil War, Harriet Tubman was a spy for the Union. She was known for her work with the Underground Railroad helping enslaved people escape to freedom in the North. Tubman also served as a scout and spy for the Union Army, providing valuable intelligence to help the Union cause. Her efforts were instrumental in various military operations and contributed significantly to the Union's efforts during the Civil War.
Therefore, the correct answer is:
- O a spy for the Union.
