Final answer:
Marcella can use the equation c = 3 divided by 18.7 to find how many carbohydrates she consumed from the one cup of air-popped popcorn. Therefore, the correct option is C.
Step-by-step explanation:
Marcella can use the equation c = 3 divided by 18.7 to find how many carbohydrates she consumed from the one cup of air-popped popcorn.
The nutritional facts state that for 3 cups of air-popped popcorn, there are 18.7 grams of carbohydrates. Marcella ate 1 cup, so she consumed a portion of the total carbohydrates. Therefore, she can use the ratio of cups to carbohydrates to find how many carbohydrates she consumed:
c = 3/18.7 = 0.16 cups
So, Marcella consumed approximately 0.16 cups of carbohydrates from the one cup of air-popped popcorn she ate.