None of the options you provided (a. Bowman’s capsule, b. Loop of Henle, c. Glomerulus, d. Convoluted tubules) are part of the circulatory system. They are all components of the renal (urinary) system, specifically involved in the function of the kidneys.
The circulatory system, on the other hand, consists of the heart, blood vessels (arteries, veins, and capillaries), and blood itself. If you need clarification or more information, feel free to ask!