What is the key assumption in new classical macroeconomics that is often questioned for its realism?

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That monetary policy has a direct impact on aggregate demandThat markets adjust slowly and do not clear immediatelyThat fiscal policy influences overall demand in the economyThat economic agents form expectations rationallyThat prices are completely rigid in the short run

Explanation

The main assumption in new classical macroeconomics that is debated for its realism is the concept of rational expectations, which implies that individuals use all available information efficiently when forecasting future economic variables.