Suppose the United States is currently producing 160 tons of hamburgers and 72 tons of tacos, and Mexico is currently producing 32 tons of hamburgers and 40 tons of tacos. If the United States and Mexico each specialize in producing only one good (the good for which each has a comparative advantage), then a total of _____________ additional ton(s) of hamburgers can be produced for the two countries combined? (Enter a numeric response using an integer.)

a. 48
b. 56
c. 64
d. 80

d. 80

If the United States specializes in producing hamburgers and Mexico specializes in producing tacos, then the United States can produce 240 tons of hamburgers (160 + 80) and Mexico can produce 40 tons of tacos. This means an additional 80 tons of hamburgers can be produced for the two countries combined.