Answer:
A.
remove import and export barriers
Explanation:
The term "Free Trade" itself already implies the idea of no barriers. In a Free Trade agreement, the countries decide that they will not impose barriers on each other, granting freedom to the market and to the people who want to spend their money in goods from the other country. The other options are incorrect because all of them are about decisions that go on the opposite direction of what a free market, or free trade, would be.