Answer:
The correct answer would be D) cardiovascular system.
The cardiovascular system of the body consists of pumping organ that is, heart, blood vessels (arteries, veins, and capillaries), and transporting medium which is blood.
It is the main system which helps in transportation of oxygen, nutrients, and hormones throughout the body. In addition, it helps in the removal of metabolic wastes such as carbon dioxide and nitrogenous wastes.