Although Every Country Fighting in World War I Suffered Food

Although every country fighting in World War I suffered food shortages at various times during the war,Great Britain eventually instituted control by rationing bread in 1917 primarily because:

A) of a poor wheat harvest in Australia.
B) English bakers were on strike.
C) the entire bread supply went to the army.
D) the English people voluntarily had limited their consumption.
E) of German submarine success in sinking Allied shipping.