A Herpes Virus Causes Both Chicken Pox and Shingles in Humans.People

A herpes virus causes both chicken pox and shingles in humans.People who have had chicken pox may be afflicted with shingles much later in life.The most likely explanation for this is that

A) the intact virus was harbored within cells and was activated.
B) the viral DNA had been incorporated into the host's genome and was later induced to enter the lytic phase.
C) the viral DNA had been incorporated into the host's genome and was later induced to enter the lysogenic phase.
D) the viral DNA became active while integrated into the host's DNA.
E) expression of host DNA genes was shut down.