What happens inside a normal cell when a inhibitory growth factor binds to its receptor of the cell membrane?

A)A transcription factor turns on mechanisms that causes a mutation in tumor suppressor gene.
B)A transcription factor turns on a proto-oncogene,which inactivates the cell cycle.
C)A transcription factor turns on a tumor suppressor gene,which activates the cell cycle.
D)A transcription factor turns on a tumor suppressor gene,which inactivates the cell cycle.
E)A transcription factor turns on a proto-oncogene,which activates the cell cyclE.