Answer :
The correct answer is A) lymph system.
When you are sick, extra white blood cells are created by the lymph system.
As part of the immune system in the human body, the lymph system regulates fluid balance and absorb fats. It is a network of vessels in the human body that passes through all the tissues for the lymph fluid to move. It similarly circulates the body as the blood does. The lymph nodes swell in the presence of an infection. That is when you have to go see a medical doctor.