Question

nafta can be defined as
a means to acquire convenient resources.
a unification treaty that limits trade barriers.
an agreement between bordering nations.
a way for corporations to more easily outsource labor.

Explanation:

NAFTA (North American Free Trade Agreement) was an agreement between the U.S., Canada, and Mexico. It aimed to reduce trade barriers (such as tariffs) among these bordering nations. While it had various impacts including on labor (but outsourcing was not its main - defined purpose) and resource acquisition was not its core definition. A unification treaty is too broad (it was a free - trade agreement), and the key aspect is that it was an agreement between bordering nations with the goal of limiting trade barriers.

Answer:

an agreement between bordering nations.