The correct option is C Forming RBC
The lymph node is an oval-shaped organ of the lymphatic system, which is widely distributed throughout the body. The lymph fluid inside the lymph node contains lymphocytes, a type of WBCs, which continuously recirculates through the lymph nodes and the bloodstream. In response to antigens, the lymphocytes in the lymph node make antibodies, which go out of the lymph node into circulation, seek and target pathogens. They also destroy bacteria.
Lymph node is not involved in the formation of RBC. So, option C is incorrect.
Thus, the correct answer is option (C), 'Forming RBC' .