Which of the following was mary walker's contribution during the civil war?
a.
she was arrested six times as the most notorious confederate spy.
b.
she was a surgeon who was awarded the medal of honor after being captured by confederate forces.
c.
she led the u. s. sanitary commission and started the red cross.
d.
she organized more than 3,000 nurses in union hospitals.

She was a surgeon who was awarded the Medal of Honor after being captured by Confederate forces.

Explanation:

she volunteered in the Union army when the Civil War broke out, serving as a surgeon. After crossing enemy lines to treat wounded civilians, she was captured by Confederate forces and detained as a spy. She was imprisoned in Richmond as a prisoner of war until her release in an exchange of prisoners between the two sides,

This heroic actions made her the only woman with the medal of honor.

d) he bring down boss tweed and tammany hall.