Final answer:
All other organs of the circulatory system exist primarily to support the function of oxygen transportation to the body's cells and removal of carbon dioxide, making option (b) the most accurate answer.
Step-by-step explanation:
The circulatory system consists of the heart, blood vessels, and blood, and it functions to transport oxygen and nutrients to the body's cells and remove waste products. The question posed asks which element the other organs of the system serve. The most accurate answer is that all other organs of the circulatory system serve to support the function of oxygen transportation (Option b). This can be deduced because the primary role of the circulatory system is to deliver oxygen and nutrients to various parts of the body, including the heart and the brain, and for the removal of carbon dioxide and other waste materials. While the heart is central to the pumping of blood, and the capillary beds are essential for the exchange of substances, the driving force behind these functions is the necessity to transport oxygen to cells and remove carbon dioxide, which is aligned with the systemic circulation.