B, the process from mature leukocytes to programmable cells is similar to dedifferentiation in plant tissue culture, that is, from highly differentiated cells to redifferentiated cells, B is correct;
C, reprogrammed cells can further differentiate into cells with different functions, thus making it possible to radically cure some diseases. C is correct;
D, the essence of "programming" is to use specific technology to selectively express genes, rather than transforming genetic material, D error.
Therefore, choose: d.