Answer:
A. Pluripotent stem cells.
Explanation:
The undifferentiated cells which can develop into specific cells as per the requirement of the body are called stem cells. Stem cells can be originate from body cells of an adult or from embryos. These cells may be pluripotent unipotent, multipotent or totipotent based on their potential to differentiate into other types of cells. The pluripotent stem cells are cannot become the cells of the placenta.
