B. OPV prevents intestinal infection with PV; IPV does not.

Yes. IPV will not prevent intestinal replication of the virus and transmission among susceptible contacts. That is why it is not appropriate for an eradication effort -- because a population immunized with IPV can still circulate polioviruses even though they do will not manifest paralytic polio. If the goal is to eradicate the virus, asymptomatic carriers must be eliminated also.

That is why the switch from OPV to IPV occurred in the U.S. in 2000, 20 years after the last indigenous case of wildtype polio. When eradication of wildtype virus is formally confirmed by the WHO in a country, that country will want to make the same switch to IPV. At that time, there will only be cVDPV left to circulate. If cVDPV infects a person who has been immunized with IPV, they will not develop paralytic polio and will develop intestinal immunity from their asymptomatic infection.