Researchers at the University of British Columbia are working on a way to analyze gene expression within a single cell as it differentiates.This is significant because

A)cDNA libraries could be made.
B)tissue identification would be easier.
C)RNA is needed to understand expression and probing a cell as it undergoes differentiation is impossible at this point.
D)DNA within a single cell is difficult to extract.
E)generation of totipotent adult stem cells would be possible.