Select the option that contains only secondary lymphoid organs.

Step-by-step solution

Primary lymphoid organs are the sites where immature lymphocytes differentiate into antigen-sensitive lymphocytes. These include the bone marrow and thymus. Secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells. These include the spleen, lymph nodes, tonsils, Peyer's patches of the small intestine, and the appendix. Option (A) contains the thymus, which is a primary lymphoid organ. Option (B) contains lymph nodes, appendix, and t