Which of the following is true about oncogenes?

A) Oncogenes are normal genes that have undergone a mutation.
B) Oncogenes cause cell division to slow down.
C) When mutated, oncogenes turn into proto-oncogenes.
D) Oncogenes increase apoptosis in surrounding cells.
E) All of the answer choices are true statements about oncogenes.

Oncogenes are normal genes that have undergone a mutation that leads to uncontrolled cell growth and division. Option B is incorrect because oncogenes cause cell division to increase, not slow down. Option C is incorrect because proto-oncogenes are normal genes that regulate cell growth and division, but can potentially become oncogenes if they undergo specific mutations. Option D is incorrect because oncogenes tend to decrease apoptosis, leading to the survival of cells that should have undergone programmed cell death.