Clubbing is a painless enlargement and flattening of the tips of fingers or toes caused by chronic hypoxia. Hypoxia is deficiency in the amount of oxygen reaching the tissues.
The correct answer is letter B. The food molecules that cannot be digested need to be eliminated from the body. This can be done by taking in certain kinds of medicines that stimulate the digestive tract to pass out the food molecules that are indigestible.
