Which of the following events would confirm the Imperfect Markets Theory?

a. A U.S. firm manufacturing computers establishes a plant in Germany in order to reduce transportation costs and to retain its advantage over its German competitors.

b. A U.S. firm manufacturing computers imports the needed components from Taiwan.

c. A U.S. firm manufacturing widgets builds a plant in Mexico to reduce labor costs.

d. All of these choices are correct.

e. None of these choices are correct.