________are aggregates of lymphatic nodules found in the area of the ileum of the small intestine.
T-Lymphocytes
Peyer's patches
Tonsils
Appendix
As we have already discussed in Immune System in Humans -
After maturation, the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer’s patches of the small intestine and appendix.
Hence, the correct answer is option b.