In order to help the student expand his/her knowledge I will help answer the question. This in hope that the student will get a piece of knowledge that will help him/her through his/her homework or future tests.
Clara Barton founded the Red Cross in America, Mary Walker was awarded the Congressional Medal of Honor, and Nancy Hart fought in a guerrilla group. By eliminating these options we have Ginnie Moon left. Who in fact was a Confederate spy during the Civil War.
I hope it helps, Regards.