The answer is D. The french gained a lot of British land and the colonies were more pressed for land. Surprisingly this battle was the British and Colonists against the French and Indians.
The North Vietnamese strategy (before the U.S. pulled troops): guerrilla warfare and traps
The North Vietnamese strategy (after the U.S. pulls troops): organized warfare with tanks, infantry
The United States was still recovering from the impact of the Great Depression and the unemployment rate was hovering around 25%. Our involvement in the war soon changed that rate.