The correct option is United State
In 2010, the private sector accounted for an estimated 55.3% of the US economy, the federal government's activities amounted to 24.1% and the activity of state and local governments occupied the remaining 20.6%. Although the US economy is post-industrial, since the services sector contributes 67.8% of GDP, the nation continues to be an industrial power, while in the business field, the leading activity for its income is retail trade. wholesale and retail; by net income is the industry, with the chemical industry being the most important, the United States is the third largest oil producer in the world, as well as the largest importer of this product. It is also the number one producer of electric power and of nuclear energy, as well as liquefied natural gas, sulfur, phosphates and salt. <u><em>While agriculture represents less than 1% of GDP</em></u>
Answer:

WW2 stands for <u>World War 2</u> which was a war that occured during Sep 1, 1939 – Sep 2, 1945.
Ans: natural gas,oil, and fresh and ground water
I think c. to increase land available for farming is the correct answer.
When farmers grow plants, the plants use up the fertility of the land, thus more and more trees and rain forests are cut down to support farmers' needs for land.
Hope this is helpful~