The answer is; B
Meristem cells are totipotent meaning they can differentiate to any type of plant cells. Therefore they can produce a variety of plant type depending on epigenetic. However, tissue culture is derived from already differentiated cells. Therefore these cells are already determined and can only produce cell type of that plant from which they were derived.
Hierarchy - I don’t think I have the full context of the question but the word fits the best of its biology related
because the doctor might not have studied her enough to diagnosed her
