Answer:
B. blood vessels.
The circulatory system is made up of the heart, blood vessels, and blood. Its main function is to transport oxygen and nutrients to the body's tissues and organs, while also removing waste products.
The nose and trachea are part of the respiratory system, which is responsible for breathing and gas exchange. The diaphragm is a muscle that helps with breathing, but it is not part of the circulatory or respiratory system.
Blood vessels, on the other hand, are a key component of the circulatory system. They include arteries, veins, and capillaries, which transport blood throughout the body.