I think the answer is c but I’m might be wrong
A free-trade zone is by definition “a place where trade is left to happen without tariffs(tax on imports/exports), quotas, or other restrictions”. An example of a free-trade zone is the European Union. There are no tariffs, quotas, or other restrictions placed on trading within the EU countries (they even share a currency). This allows for them to place products at a cheaper price for good quality and still get enough money to grow wealth within the different countries.
Response questions genuinely focus on gathering opinions from the readers on what they think about the work, without mentioning the author's or any other person stated inside the stories's view. However, this does not mean that the reader cannot agree to the author
hope this helps
Khan Academy is a great place to go to if you are ever struggling in any subject including AP Biology. There are so many helpful videos and I learned so much more from it than in an actual school setting!