A. The hosts body could reject the transplanted stem cells
B. essential
We cannot store up amino acids on our body, but we can have amino acids through consumption of food. These amino acids of which the body cannot make is called as essential amino acids.
Answer: B
Why? It is not A or D for many reasons but cell differentiation is used for very specific functions as cell determination is used for different embryonic functions. Based on the diagram I seems to me that it is not very specific so that’s why I think it’s B
(If it’s not be then is 100% C but B makes more sense)
Hope this helps