Based on experiments with amphibian embryos, Spemann and Mangold found that

A) transplanted cells always died.
B) transplanted cells always formed a whole new embryo.
C) in most cases, transplanted donor cells assumed the developmental fate of the area to which they were transplanted in the host.
D) transplanted cells completely undifferentiated into random masses of tissue.
E) donor cells maintained their original differentiation no matter where in the host they were transplanted.