When the australian economy was based on import-substitution manufacturing, a. domestic production assured national prosperity. b. protectionist policies were emphasized. c. domestic manufacturing was discouraged. d. expansionist policies were emphasized.

The best answer among the following choices would be the third option aka C) Domestic manufacturing was discouraged because when the Australian economy was based on import substitution manufacturing it lowered the domestic manufacturing so you could say it was replaced.

Dall of the above all of the choices make sense