Final answer:
The circulatory system works with the immune system to transport white blood cells throughout the body, playing a vital role in maintaining health and facilitating immune responses. The correct answer is option A.
Step-by-step explanation:
The system that works with the immune system to help transport white blood cells is the circulatory system. The circulatory system's extensive network of blood vessels supplies all parts of the body with necessary substances, including oxygen and nutrients, while also removing waste products like carbon dioxide. It plays a key role in maintaining overall health by transporting white blood cells and antibodies, which are essential components of the immune response. The lymphatic system, which is also part of the immune system, includes lymph organs, vessels, and nodes that are crucial for transporting lymphocytes and facilitating an immune response.