The right option is; B.fiber
Fiber is the food component that is indigestible by the body.
Fiber is the indigestible edible component of plant-based foods that cannot be broken down into digestible sugar molecules, and is indigestible by the body. Fiber can be found in all plant foods such as vegetables, legumes, fruits, nuts, seeds, and grains. Fiber performs important functions in the body such as digestion and regularity, cholesterol and blood sugar control, and weight management.
