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.

C.) she led the U.S sanitary commission and started the Red Cross.

Explanation:

As well as many other things helping soldiers on both lines.

Explanation:

In 1865, she was honoured with the Medal of Honor for her work during the Civil War. First, she worked has a nurse, but in no time she began to perform as a surgeon with the Ohio 52nd Infantry.

According with some texts, she was a prisoner of war and exchanged for a Confederate Soldier. Her presence in history meant a breakthrough for medicine.