The use of embryonic stem cells is ethically debated in the United States.Embryonic cultures are highly documented and the research activities are strongly regulated.Individual states disagree on whether,or how much embryonic stem cell research can be done.Some people,politicians,and researchers are optimistic that what lessons can be learned from embryonic stem cells can eventually lead to less controversial use of adult stem cells,because
A) with more research, scientists will be able to "turn on" genes in pluripotent adult stem cells. B) heavier regulations will force the issue by completely stopping the use of embryonic stem cells. C) researchers will run out of available human embryos that are currently available for research. D) it will be simpler to extract more adult stem cells as more people learn about the option to donate.