It is clear that to produce the maximum material comfort for its citizens, a nation needs to .

(A) Limit competition from the products of foreign nations
(B) Strive for self-sufficiency
(C) Subsidize the sale of lots of goods and services
(D) Specialize in producing something that it is relatively good at producing

(D) Specialize in producing something that it is relatively good at producing.

Explanation:

When a country specialises in production of a good it is relatively good at producing, its citizens will not find it difficult to manufacture the good for local consumption and export.

If the country needs product it is not good at producing it imports it from other countries that have a competitive advantage in producing it.

This will produce maximum material comfort for its citizens.

15 pounds of apples and 6 cups of flour

answer; commerce clearing house;