19. It can reasonably be inferred from the passage that a main contribution of Keynes to economic theory was the idea that:

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

Requirements for the question: What can be inferred that Keynes made major contributions to economic theory? According to the title stem, it is located at L12-15. The idea of ​​using fiscal policy to control economic activities originated from Keynes.