Suppose Firm A can manufacture 100 pens and 20 umbrellas with a unit of labor, and Firm B can manufacture 80 pens and 10 umbrellas with a unit of labor. Which one of the following statements is true? Firm A has the comparative advantage in both pen and umbrella production. Firm B has an absolute advantage in umbrella production. Firm A has a comparative advantage only in pen production. Firm B has a comparative advantage in pen production. Neither firm has a comparative advantage in either pen or umbrella production