What is comparative​ advantage?

A. The gain from selling a product for more than it costs to produce that product.
B. The gain from consuming a product whose benefit is greater than its cost.
C. The ability to produce a good or service at a lower opportunity cost than other producers.
D. The ability to produce more of a good or service than competitors using the same amount of resources.
E. The ability to use all available resources to produce output.