Point a on a Linear Production Possibilities Curve Represents a Combination

Multiple Choice

Point A on a linear production possibilities curve represents a 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) 6
B) 4
C) 3
D) 1/3