Assume point A on a linear production possibilities curve represents the combination of 12 coffees and 3 cappuccinos, and point B represents 3 coffees and 6 cappuccinos. Suppose coffees are on the vertical axis and cappuccinos are on the horizontal axis. The absolute value of the slope of the production possibilities curve between points A and B equals:
A.4
B.1/3
C.3
D.6
正确答案:3