The Designation "B" for B Lymphocytes Comes from

The designation "B" for B lymphocytes comes from

A) the bursa of Fabricius in birds where these cells were first identified.
B) the sequence in which these lymphocytes were discovered.
C) the bone marrow where these cells are produced.
D) the fact that these cells produce antibodies.
E) the ability of these cells to provide immunity through body fluids.