The statement that is proven true with an investigation of NAFTA is: "NAFTA resulted in job losses for some Americans but also lower prices on goods sold in the U.S."
NAFTA did lead to significant changes in trade among the member countries (the U.S., Canada, and Mexico), including job losses in some industries in the U.S. but also resulted in lower consumer prices and increased access to goods in the market. The other statements either contain inaccuracies or represent misinterpretations of the effects of NAFTA.