Once the U.S. government opened its domestic markets to international trade, the competition from imported cars, steel, and other products caused demand for similar U.S. goods to

A. continually increase leading to an overall increase in union membership.

B. fall, leading to lower output, fewer workers, and an overall decline in union membership.

C. decline, causing workers to call upon governments to pass indexed wage protection laws.

D. rise, but laws made it difficult for new workers to become union members.