Answer:
B. fiber
Step-by-step explanation:
Fiber is a type of carbohydrate but it can not be digested unlike other carbohydrates which can be broken down into smaller sugars. It finally passes out the body undigested and makes bulk of the stool. Hence it is very important part of diet.
Regular intake of 20 to 30 grams of fiber keeps digestive system healthy and constipation is avoided. It also reduces the risk of diabetes and heart disease. There are two types of fiber, soluble and insoluble. Fiber is mainly present in whole grains, legumes, fruits, nuts etc.