The absolute value of the slope of the production possibility frontier at any point:
A) gives the autarky price of the good on the vertical axis.
B) is found by dividing the horizontal change by a vertical change.
C) gives the quantity of the good on the vertical axis that must be given up to produce an additional unit of the good on the horizontal axis.
D) gives the autarky price of the good on the horizontal axis relative to the autarky price of the good on the vertical axis.