Final answer:
The white pulp of the spleen is enriched with B and T lymphocytes, which are key players in the adaptive immune response.
Step-by-step explanation:
The white pulp of the spleen is enriched in lymphocytes, specifically B and T cells. These cells are central to the adaptive immune response, with B cells being responsible for antibody production and T cells for cell-mediated immunity. B cells can differentiate into plasma cells, which secrete soluble antibodies in response to antigen binding. The spleen serves as a secondary lymphoid organ where these immune cells can encounter antigens, proliferate, and mount an immune response. Therefore, the correct option is d) B and T lymphocytes.