Which of the following statements is true?

A) Keynesians believe that consumers are inherently unstable in consumption decisions,but that businesses are relatively stable in making investment decisions.
B) Monetarists believe in discretionary monetary policy.
C) Lowering tax rates is the main priority of Supply Side economists.
D) Rational expectationists argue that businesses have a poor record of anticipating government fiscal policy.
E) All of the statements are true

Keynesians

are economists or adherents of the economic theories of John Maynard Keynes, who advocated for government intervention in markets to mitigate the adverse effects of economic cycles.

Monetarists

Economists who theorize that alterations in the money supply have a major influence on the national output in the short run and affect price levels over more prolonged periods.

Rational Expectationists

Economists who argue that individuals make decisions based on their rational outlook, available information, and past experiences.