The correct option is
B Lymph nodes
Wuchereria bancrofti is a human parasitic roundworm that is the major cause of lymphatic filariasis. The adult parasites reside in the lymphatics (lymph glands and lymph nodes) of the human host. They are found mostly in the afferent lymphatic channels of the lymph glands in the lower part of the body. Wuchereria is spread by a variety of mosquito vector species.
So, the correct answer is 'Lymph nodes'.