Table 2-3 Production Possibilities for Footville

Table 2-3
Production Possibilities for Footville
-Refer to Table 2-3. Which of the following statements is correct?

A) The opportunity cost of an additional 200 shoes is constant at 200 socks.
B) The opportunity cost of an additional 200 shoes is constant at 300 socks.
C) Footville's production possibilities frontier is a straight, downward-sloping line.
D) The opportunity cost of an additional 200 shoes increases as more socks are produced.