Final answer:
The opportunity cost of moving from point B to point C on a production possibilities frontier is the amount of foregone healthcare necessary to gain additional education, represented by the slope of the PPF between these points.
Step-by-step explanation:
The question relates to the concept of opportunity cost in economics, specifically as it applies to a production possibilities frontier (PPF), which is a graphical representation of all possible combinations of two goods that a society can produce given fixed resources. According to the scenario described, as a society moves from point B to point C on the PPF, the opportunity cost of the additional education is determined by the slope of the curve between these two points. This slope is calculated by taking the foregone healthcare (the vertical distance or 'rise') over the additional education (the horizontal distance or 'run').
The slope of the PPF between points B and C represents the rate at which healthcare must be sacrificed to gain additional units of education. Therefore, the opportunity cost of moving from point B to point C is the amount of foregone healthcare needed to gain more education.