What Is the Oncogene That Is Most Often Mutated in Human

What is the oncogene that is most often mutated in human tumors and what does it encode?

A) the RAS gene, a GTP-binding protein that serves as an on-off switch for a key cell signaling pathway that controls cell proliferation
B) the RAS gene, a DNA polymerase that replicates DNA for dividing cells
C) the MYC gene, an RNA polymerase that transcribes mRNA encoding proteins needed for cell division
D) the RB gene, a GTP-binding protein that serves as an on-off switch for a key cell signaling pathway that controls cell proliferation
E) the MYC gene, a protein kinase that enhances cell differentiation