Answer:B nerve cell
Step-by-step explanation:
a. stem cell
is the root of stem cells
b. nerve cell
originates and stem cell, but then transforms in the nerve cells as the body (when in womb) needs it.
C. meristem
like a plants stem cell
D. side stem cell
has stem cell in the name and still is a stem cell
My explanations are not top notch but hopefully kinda helps.