Which of the Following Observations Provides Evidence That a Virus

Which of the following observations provides evidence that a virus uses reverse transcriptase? (Select all that apply)

A) positive sense RNA is found within the host cell
B) actinomycin D prevents viral replication
C) heteroduplexes form when viral mRNA is added to infected host cell extracts
D) dsDNA strands form when cDNA is added to infected host cell extracts
E) inhibition of cellular DNA-dependent RNA polymerase has no effect on viral replication