Blood cells and stomach cells have some similarities, but they primarily serve different functions in the body. However, if we are looking for general functional similarities, the most fitting option from your list would be:
Both help maintain homeostasis.
Blood cells, particularly red blood cells and white blood cells, play crucial roles in oxygen transport, immune responses, and overall fluid balance, contributing to homeostasis. Stomach cells, particularly gastric cells, produce digestive enzymes and acids that assist in food breakdown and absorption, which also plays a role in maintaining the body's balance of nutrients and pH levels.
The other options are more specific to the functions of either blood cells or stomach cells and do not apply to both types of cells universally.