Final answer:
The correct set-up to calculate the cost of fruit in dollars per gram, given that the price is given as 0.79 dollars per pound, is option b.
Step-by-step explanation:
The correct set-up to calculate the cost of fruit in dollars per gram, given that the price is given as 0.79 dollars per pound, is option b. 0.79 dollar/lb x 457 g/1 dollar.