Biology

The correct answer is C. Circulatory.

The circulatory system, also known as the cardiovascular system, is responsible for pumping blood throughout the body. It consists of the heart, blood vessels (arteries, veins, and capillaries), and blood. The main function of the circulatory system is to transport oxygen, nutrients, hormones, and waste products to and from the body's cells.

Option A, the respiratory system, is responsible for the exchange of gases, primarily oxygen and carbon dioxide, between the body and the environment. While oxygen is carried by the circulatory system, the respir...