Your answer will be D Mexican businesses have relocated to the united states where labor costs are lower because back in Mexico labor caused a lot of money and bad conditions because of the hot climate Mexico has and Mexicans move to the United States because offers more money and better life for their families and businesses also its not A because it doesn't reduce trade reduces means lower the chance they would trade its also not B because Canada exports some of their good to the United States but not its biggest market for Canada when it came down to rather C ,or D I choose D because it wasn't bloc for the intercontinental trade to be developed or happen. Your answer is D.
