The HIV Genome's Reliably High Rate of Change Permits It

Multiple Choice

The HIV genome's reliably high rate of change permits it to serve as a molecular clock. Which of these features is most responsible for this genome's high rate of change?

A) the relatively low number of nucleotides in the genome
B) the relatively small number of genes in the genome
C) the genome's ability to insert itself into the genome of the host
D) the lack of proofreading by the enzyme that converts HIV's RNA genome into a DNA genome