The Ottoman Empire's Involvement in World War I Altered the Dynamics

The Ottoman Empire's involvement in World War I altered the dynamics of the war by threatening Russia's supply lines and:

A) blocking allied entry to the Dardanelles.
B) disallowing a combined striking force of French and British on the Eastern front.
C) the safety of the British-French fleet in the Aegean sea.
D) endangering Britain's control of the Suez Canal.
E) the fortified Greek city of Athens.