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The producer that requires a smaller quantity of inputs to produce a certain amount of a good, relative to the quantities of inputs required by other producers to produce the same amount of that good,

a$.$ has a comparative advantage in the production of that good.

b$.$ has a low opportunity cost of producing that good, relative to the opportunity costs of other producers.

c$.$ has an absolute advantage in the production of that good.

d$.$ should be the only producer of that good.