Which of the Following Had Been a Traditional Belief Prior

Which of the following had been a traditional belief prior to the economic theories of John Maynard Keynes?

A) Balanced budgets were sacred.
B) A bimetallic standard was superior to the gold standard.
C) Depressions typically emerged from a consumer's crisis of confidence.
D) A national economy always benefited from a trade surplus.
E) Deficits are not a problem, as long as they don't enlarge national debt.