An argument that was used in support of NAFTA's passage in the U.S. was that: a. lower wages in Mexico would lead to more jobs being created in Mexico. b. the cultures of all three countries would not be affected by NAFTA. c. tougher environmental laws in Mexico would eventually be applied to all three countries. d. U.S. shipments to Mexico faced tariffs two-and-a-half times the average U.S. rates