Transplantation Experiments Showed That

Transplantation experiments showed that

A) different progenitor cells give rise to distinct cell types in the cortex.
B) common progenitor cells gain more and more competence to create different cell types as development proceeds.
C) common progenitor cells have more and more restricted competence to develop into different cell types as time progresses.
D) common progenitor cells do not change their competence level during development.
E) None of the above