Which of the Following Statements Regarding Viral Diseases Is False

Which of the following statements regarding viral diseases is false?

A) RNA viruses tend to have an unusually high rate of mutation because their RNA genomes cannot be corrected by proofreading.
B) New viral diseases often emerge when a virus infects a new host species.
C) Very few new human diseases have originated in other animals because the genetic differences are too great.
D) AIDS was around for decades before becoming a widespread epidemic.