The Cold War, or "War on Communism

The Cold War, or "war on communism,"

A) was the most expensive war of the twentieth century.
B) is believed to have caused an increase in defense spending that came at the expense of private consumption rather than private investment.
C) is believed to have caused an increase in defense spending that came at the expense of private investment rather than private consumption.
D) Both a and b are correct.
E) Both a and c are correct.