If Embryonic Neural Crest Cells That Normally Become Parasympathetic Neurons

Multiple Choice

If embryonic neural crest cells that normally become parasympathetic neurons are transplanted into the region that normally develops into sympathetic neurons, and those transplanted cells take on a sympathetic fate, what does this suggest about how autonomic neural crest cells are directed to become sympathetic or parasympathetic?

A) Neural crest cell fates are determined before they begin migrating away from the neural tube.
B) Neural crest cells are differentiated when they leave the neural tube.
C) Neural crest cell fates are not determined by where they originally arise in the spinal cord.
D) Neural crest cells that do not express the appropriate phenotype for their location die.