I think it might be the cutting back on military spending because of the economy.
I believe the answer is A, good luck
The Cuban Missile Crisis was NOT a cause of the Spanish American War because it did not occur until much later in history. However, yellow journalism, the sinking of the U.S.S. Maine off the coast of Havana, and American sympathy for the Cuban Revolution were causes of the Spanish American War.
The Germans defeated Russia during the World War I. The reason for its loss was that the Czar of Russia embarked on war that the country was not prepared for. He took control of the army and his strategies were a failure which left him with all the humiliating defeat and blame of its people.