Why do adult stem cells currently have fewer uses in therapeutic cloning than embryonic stem cells? A. Adult stem cells have more restrictions that prevent them from reentering the cell cycle at the G0 stage. B. Embryonic stem cells have longer telomeres and persist for much longer than adult stem cells. C. Adult stem cells may become any type of cell, whereas embryonic stem cells may only become adult stem cells first. D. Embryonic stem cells may become any type of cell, whereas adult stem cells may only become a limited number of cell types