Answer: C. Phase out all trade and tariff barriers among Canada, Mexico, and the U.S.
The North American Free Trade Agreement (NAFTA) was an agreement made between the United States, Canada, and Mexico which paved way for a trilateral bloc in the continent of North America. The agreement was made to reduce drastically or eliminate all forms of tariffs, or barriers to trade and investment between Canada, the United States, and Mexico.
This agreement only covered the freedom of movement of goods and services but does not go into labor. When President Donald Trump assumed office as the president, NAFTA was replaced with the USMCA (United States-Mexico-Canada Agreement)