A. served in the military and worked in war production
Explanation:
According to Wikipedia, as many as 25,000 Native Americans in World War II fought actively: 21,767 in the Army, 1,910 in the Navy, 874 in the Marines, 121 in the Coast Guard, and several hundred Native American women as nurses.
Serving in the military and involvement in war was a common practice by the Native Americans during that period.
