When the Nation of Brownland First Permitted Trade with Other

Multiple Choice

When the nation of Brownland first permitted trade with other nations,domestic producers of wheat experienced an increase in producer surplus of $4 million and total surplus in Brownland's wheat market increased by $1 million.We can conclude that

A) Brownland became an exporter of wheat.
B) consumer surplus in Brownland increased by $3 million.
C) the opening of trade caused the domestic supply curve for wheat in Brownland to shift to the left.
D) this example is inconsistent with the economic theory of international trade.