None of these volunteers ever had chicken pox. after the injection, there would most likely be antibodies to chicken pox in the bloodstream of

According to the table volunteer A was injected with Dead chicken pox virus, Volunteer B was injected with Dead Mumps virus, Volunteer C was injected with distilled water, while Volunteer D was injected with both the Dead chicken pox and Dead Mumps virus.

After injection, there would be most likely be antibodies to chicken pox in the blood stream of Volunteers A and D only. This is because both of them were injected with Dead chicken pox virus and therefore the body reacted by producing antibodies against the Dead chicken pox virus, which is harmless to the body cells, but in case of infection by the virus, the antibodies are able to respond and counteract their effect.