Answer:
The correct option is oncogenes
Step-by-step explanation:
An oncogene is a gene that has mutated and contributes to the development of cancer. Oncogenes are resposible for the transformation of a normal cell into a malignant one that will develop a certain type of cancer. Cancer cells are cells that are in uncontrolled mitosis. When a gene of this type undergoes a mutation (during cell division or because of external mutagens) and the activity of the protein it encodes is altered, it is called an oncogene.
In their normal non-mutated state, oncogenes are called proto-oncogenes. These play an important role in the regulation of cell division.
The mutant protein that an oncogene encodes may differ from the healthy version by a single aminoacid. But this simple alteration can radically change the function of the protein. The most common mutation, which causes cancer, occurs in the general ras.