Production Possibilities Tables for Two Countries,North Cantina and South Cantina

Multiple Choice

Production possibilities tables for two countries,North Cantina and South Cantina:
North Cantina
Production possibilities (alternatives)
South Cantina
Production possibilities (alternatives)

-Refer to the above tables.If South Cantina is producing at production alternative D,the opportunity cost of the third unit of capital goods is:

A) 3 units of consumer goods.
B) 4 units of consumer goods.
C) 5 units of consumer goods.
D) 6 units of consumer goods.