Answer:
B. Endocrine and Digestive
Explanation:
The hormone aspect of the scenario is a part of the endocrine system and the food/stomach part relates to the digestive system. The immune system does not deal with the break-down of food but rather the protection of the body from viruses and such. The excretory system is responsible for the regulation of water through urination/sweating so it can't be that one either.
