Which of the following is NOT true regarding cell-type specification in developing animals?

A) Members of the MyoD/myogenin family of transcription regulators drive cells to differentiate into muscle cells.
B) Members of the Achaete/Scute family of transcription regulators drive the cells to form endothelial layers.
C) Many proteins that induce the differentiation of particular cell types belong to the bHLH (basic helix-loop-helix) class of transcription regulators.
D) Eyeless is both necessary and sufficient to generate eye structures composed of various specialized cell types in Drosophila.
E) In vertebrates, loss of the Eyeless homolog Pax6 leads to an animal without eyes.