The provirus or the prophage is a condition, in which the viral genome gets incorporated with the host's genome. In this case, the host treats the virus's genome as its own and the genome of the virus is now able to multiply and produce its effect with the host's genome. The virus's genome can use use the host's resources to make proteins and to replicate. Hence, the correct step depicting the incorporation of the viral genome in host's genome showing provirus stage is step B.
