Answer:
A.
Explanation:
The circulatory system can be defined as a system of organs and tissues. This includes the heart, blood vessels, lymph glands, etc. This is also known as the cardiovascular system.
The one way in which the circulatory system helps in maintaining the body temperature is by controlling the flow of blood to the skin. When in cool temperature, body thermoreceptors send signals to the nervous system, signaling to maintain body temperature.
Therefore, option A is correct.
