France Abandoned Its Attempt to Control Mexico

France abandoned its attempt to control Mexico

A) because the effort proved to be unprofitable.
B) when the British pressured them to leave.
C) when the American Civil War began.
D) because the Mexicans declared independence.
E) when the United States threatened to use military force after the conclusion of the Civil War to expel France from Mexico and overthrow the French puppet leader, Maximilian.