When viral dna combines with the host cell's dna, the viral dna becomes a

Prophage

Explanation:

Prophage is a viral genome (e.g. bacterihage genome) which is inserted into host genome (e.g. bacterial genome). Such integrated genome-prophage is in its latent phase, because there is no lysis or disruption of host cell. After the latent period, prophage induction occurs in which viral replication begins.

lets get this bread mom

thinking it would be d not too sure but i think it's right