The correct option is B RBCs
As blood passes through the capillaries in tissues, water and other substances move out from the tiny blood capillaries into the spaces between the cells of tissues. This fluid is then collected by the lymphatic system with its network of tubules and ducts. This clear fluid that oozes out from the blood vessels is known as lymph. The lymph lacks few proteins and RBCs that are present in blood.
Other than lymph, the lymphatic system consists of lymph vessels and lymph nodes. Spleen is an example of a lymphoid organ. It is the largest organ of the lymphatic system and is present in frogs as well as human beings.