Which of the Following Is True

Which of the following is true?

A) The United States is rich because it has democratic political institutions.
B) Economic growth is primarily the result of gains from trade, discovery of better ways of doing things, and capital investment.
C) Without foreign aid, poor countries are unable to break the cycle of poverty, low savings and investment, and economic stagnation.
D) Most all countries with an abundance of natural resources have been able to achieve rapid growth and high levels of per capita income.