When Mice Are Born, Their Intestinal Lamina Propria Lacks T_H17

When mice are born, their intestinal lamina propria lacks T_H17 effector cells. These cells develop after birth due to:

A) Stimulation by antigens derived from commensal microbes that populate the gastrointestinal tract after birth
B) Stimulation by retinoic acid from dietary sources
C) Stimulation by IL-10 produced from FoxP3+ regulatory T cells
D) Stimulation by short-chain fatty acids derived from commensal microbes that populate the gastrointestinal tract after birth
E) Stimulation by antimicrobial peptides produced by intestinal epithelial cells