If Nation a Has an Absolute Advantage Over Nation B

If nation A has an absolute advantage over nation B in the production of a product, this implies that:

A) it requires fewer resources in A to produce the good than in B.
B) the cost of producing the good in terms of some other good's production that must be sacrificed is lower in A than in B.
C) nation B could not benefit by engaging in trade with A.
D) nation A could not benefit by engaging in trade with B.