Which of the Following Is True of a World Without

Which of the following is true of a world without trade that has industries where economies of scale are important?

A) The variety of goods that a country can produce and the scale of production are limited by the size of the market.
B) Each nation will specialize in producing a narrower range of products than it would in the presence of trade.
C) Each nation can simultaneously increase the variety of goods available to its consumers and lower the costs of those goods.
D) The absence of trade is mutually beneficial because it allows for the specialization of production.
E) The first movers in an industry may get a lock on the world market that discourages subsequent entry.