Final answer:
The correct answer is 3 cups, 750 mL.
Step-by-step explanation:
The correct answer is c) 3 cups, 750 mL.
According to the information provided, serving size for grain products is 120 mL (0.5 cup). So, to determine the amount of popcorn, we need to convert that serving size to cups and milliliters.
Since 1 cup is equal to 240 mL, 0.5 cup is equal to 120 mL. Therefore, the correct answer is 3 cups, 750 mL, which is option c).