Respuesta :
Answer:
Option B, cloning and stem cell harvesting
Explanation:
Cloning and stem cell harvesting is strongly opposed in US because of the origin of stem cell being used in the research.
Basically the stem cells are taken from the embryo of human beings that has not taken birth. These stem cells are essential growth cell which are necessary for the survival of young embryo to convert into a fully grown human being.
IF these stem cells are extracted at the embryonic development stage, then embryo is unable to survive and it dies.
There fore option B is correct.