I think it would be (d) pyschoanalytic theorist.
People in North America tend to be more cube-like to fit the weather, while the people in South America tend to be tall and thin. The south grows more food than the north. People from South America tend to have darker skin colors than in North America.
<h3><em><u>The production possibilities curve (PPC) is a graph that shows all of the different combinations of output that can be produced given current resources and technology. Sometimes called the production possibilities frontier (PPF), the PPC illustrates scarcity and tradeoffs.</u></em></h3>
