The correct answer is D. (a) and (c).
American buyers are generally price-sensitive, but they are also increasingly concerned about the environment and social responsibility. As a result, they are more likely to purchase goods that offer the best quality for the least money, but they are also willing to pay more for goods that are made in America or that are produced in an environmentally or socially responsible way.
Option A is correct because American buyers are generally price-sensitive. They want to get the best value for their money, and they are willing to shop around to find the best deals.
Option B is incorrect because American buyers are not always willing to pay more for goods that are made in America. They are more likely to purchase goods that are made in America if they believe that the goods are of higher quality or if they believe that the company that produces the goods is committed to environmental or social responsibility.
Option C is correct because American buyers are increasingly concerned about the environment and social responsibility. They are more likely to purchase goods that are produced in an environmentally or socially responsible way, even if those goods are more expensive.
Option E is incorrect because both option A and option C are correct.