Final answer:
Harriet Tubman is known for her service as a spy for the Union Army during the Civil War. She also played vital roles as a scout and a nurse. Clara Barton and Jennie Hodgers made distinct contributions during the Civil War period too.
Step-by-step explanation:
Among the options given, Harriet Tubman is famous for her service as a spy for the Union Army during the Civil War. Though known most prominently for her role as a conductor on the Underground Railroad, Tubman also provided invaluable services as a spy, scout, and nurse for the Union side. It's important to note that the other options, Clara Barton and Jennie Hodgers, also made significant contributions during this period. Barton is notably remembered as the founder of the American Red Cross, while Hodgers disguised herself as a man to serve in the Union Army.
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