Final answer:
Lymphoid stem cells mature into B-lymphocytes, T-lymphocytes, and NK cells. B cells mature in the bone marrow while T cells mature in the thymus. Monocytes are not derived from lymphoid stem cells, but from myeloid stem cells.
Step-by-step explanation:
Lymphoid stem cells have the potential to mature into different types of lymphocytes, which are crucial cells within the adaptive immune response. These include B-lymphocytes (B cells), T-lymphocytes (T cells), and natural killer (NK) cells. B cells mature within the bone marrow (hence the 'B'), and T cells mature in the thymus (hence the 'T'). Lymphoid stem cells do not give rise to monocytes; myeloid stem cells do that as part of a different cell lineage. Therefore, the correct answer to the student's question about what lymphoid stem cells mature into is 'D. B-lymphocytes, T-lymphocytes, and NK cells.'