Most Retroviruses, with the Exception of Lentiviruses, Can Only Infect

Most retroviruses, with the exception of lentiviruses, can only infect cells that are actively dividing.Which of the following explains the primary reason for this?

A) The viral genome is amplified by replicating cells.
B) They need actively replicating cells to spread the virus throughout the body.
C) They need the cell to undergo mitosis so the viral genome can enter the nucleus.
D) They need the cell to produce high levels of nucleotide triphosphates.
E) They need the cell to produce DNA polymerase to replicate the viral genome.