I think is very respectful to learn their names. So is C
I think it's most likely D because when I googled the definition it said something about gas so yeah
Are the bumps kinda hard and squishy? If so they could possibly be either fat deposits or tumors. Its always best to get an expert approval so I recommend taking the dog to the vet just to be on the safe side.
The correct answer that would best complete the given statement above about nutritional labels would be IRON. Vitamin A, Vitamin C, Calcium and Iron (in order) are required to appear on nutritional labels. In addition, fortified nutrients are also included in the label. Hope this answer helps.