Why did only half of Oklahoma's eligible men register for service in World War I?
A. Oklahoma's large percentage of communists opposed any kind of war.
B. The state's majority-German population refused to go to war against other Germans in Europe.
C. Many claimed exemption because they did not support the war effort.
D. The federal draft had reached a surplus of available troops early on in the war, so fewer
Oklahomans were needed.