For Applications in Gene Therapy,what Is the Most Favorable Characteristic

Multiple Choice

For applications in gene therapy,what is the most favorable characteristic of retroviruses?

A) Retroviruses have an RNA genome.
B) Retroviruses possess reverse transcriptase.
C) DNA copies of retroviral genomes become integrated into the genome of the infected cell.
D) Retroviruses mutate often.
E) Retroviruses are not immunogenic.