Given below are two statements.

Statement I: The bone marrow and thymus are primary lymphoid organs in which immature lymphocytes differentiate into antigen-sensitive lymphocytes.

Statement II: The spleen and lymph nodes are secondary lymphoid organs which provide sites for the interaction of lymphocytes with the antigen, which then proliferate to become effector cells.

In light of the above statements, choose the most appropriate answer from the options given below.

Statement I is correct. The bone marrow and thymus are the primary lymphoid organs responsible for the differentiation of immature lymphocytes into antigen-sensitive lymphocytes. Bone marrow generates mature B lymphocytes and immature T lymphocytes. Maturation of T-lymphocytes occurs in the thymus.
Statement II is also correct. The spleen and lymph nodes are secondary lymphoid organs. These organs do not produce lymphocytes but provide the necessary environment for their interaction with antigens. Upon encountering an antigen, lymphocytes in the spleen and lymph nodes proliferate to become effector cells that combat the specific pathogen.