The two major fluid transport systems of the body are:

The correct answer identifies the cardiovascular and lymphatic systems as the two major fluid transport systems in the body. The cardiovascular system is responsible for circulating blood throughout the body. It delivers essential nutrients, oxygen, and hormones to cells while also removing waste products such as carbon dioxide and metabolic waste.

On the other hand, the lymphatic system plays a critical role in maintaining fluid balance by transporting lymph, a fluid containing infection-fighting white blood cells, throughout the body. It helps drain excess interstitial fluid, filters it through lymph nodes, and returns it to the bloodstream. This dual system ensures that both blood and lymph are effectively managed within the body, thus facilitating vital physiological processes, including immune response and nutrient transportation.

Other systems mentioned, such as the urinary and digestive, primarily focus on filtering waste and food processing, respectively, rather than serving as primary fluid transport systems. The endocrine system is involved in hormone transportation but not in overall fluid transport, and the terms "Benzedrine" and "Phenundrial" refer to medications that do not pertain to the body’s fluid transport systems. Thus, the cardiovascular and lymphatic systems are essential for robust physiological functioning and fluid homeostasis.