Digestive problems can be caused by A. Overeating
B. A food tolerance
C. A food allergy
D. All of the above

D. all of the above

Explanation:

The larger amount of food you eat, the longer it takes to digest especially unhealthy food.

Food allergies and digestive problems are the same it is known as food tolerance, eating certain foods can cause abdominal symptoms.

If you frequently consume food you are tolerant to, it's hard to correlate symptoms to a specific food, they often involve the digestive system, skin, and respiratory system.

i would definitly say b : )