A Society Can Produce Two Goods: Green Tea and Vitamin

Multiple Choice

A society can produce two goods: green tea and vitamin water. As this society moves down its production possibility frontier, producing more and more units of vitamin water, the opportunity cost of producing vitamin water increases. The society's production possibilities frontier will be

A) positively sloped and bowed outward.
B) positively sloped and bowed inward.
C) negatively sloped and bowed outward.
D) negatively sloped and bowed inward.