What Is the Advantage of a Policy of Import Substitution

What is the advantage of a policy of import substitution?

A) setting up an industry to replace imports minimizes risk of failure because the market for the product already exists in the nation as evidenced by the nation's imports of the commodity
B) It is easier for developing nations to protect their domestic market against foreign competition than to force developed nations to lower their trade barriers against their manufactured exports
C) foreign firms are induced to establish tariff factories to overcome the tariff wall of developing nations
D) all of the above.