The correct answers are A) rationing, B) war bonds, and E) women working in factories.
These were common aspects of war efforts during World War 1: rationing, war bonds, and women working in factories.
After maintaining its foreign policy of neutrality, the United States entered World War 1 after the Army intercepted the Zimmerman telegraph where Germany asked Mexico for help and after the sinking of the Lusitania ship by the German navy. The US entered WW1 on April 6, 1917. The US government asked the citizens to do their part to help the war effort. It asked civilians to buy war bonds, rationing food to send supplies needed in the war front, donate to charity, to go the extra mile producing more goods, and women taking over many of men's jobs.
