Answer:
The correct answer will be option-A
Step-by-step explanation:
The respiratory system is the series of organs which is links the internal gases with atmospheric gases that is it is responsible for the exchange of gases in the animal kingdom.
The respiratory system involves the intake of oxygen and exhalation of carbon dioxide as a waste product.
The primary organs involved in the respiratory system are the lungs which along with the circulatory system transports the oxygen to every cell of the body.
Since the respiratory system along with the circulatory system allows the transport of oxygen to every cell therefore, option-A is the correct answer.