Which of the Following Best Describes Comparative Advantage

Multiple Choice

Which of the following best describes comparative advantage?  

A)  the ability of an individual to specialize and produce a greater amount of some good than can another individual 
B)  the number of units of one good given up in order to acquire something else 
C)  the ability of an individual to produce a good at a lower opportunity cost than can another individual 
D)  the amount of labour a particular individual needs to produce a fixed amount of capital goods