The correct answer to this question would be alternative A)"A U.S. labor union leader."
The North American Free Trade Agreement (NAFTA) is an agreement by which the north american countries of Mexico, Canada and the United States of America negotiated in order to remove barriers to the exchange of goods an services among the countries.
A U.S. Labor Union Leader is more likely to contest NAFTA, as it more directly affects them. According to some sources, it has had positive effect on U.S. Exports and Imports, meaning the sector and the businesses, but it doesn't reflect the reality of the workers, that are "forced" to accept lower wages and benefits.
