-The Table Above Gives Information on the Perceived Marginal (Private)

-The table above gives information on the perceived marginal (private) benefit and marginal social benefit associated with vaccination against varicella (chicken pox) . If the marginal cost of a varicella vaccination is $10, then the efficient quantity of vaccinations is

A) 3 million vaccinations.
B) 4 million vaccinations.
C) 5 million vaccinations.
D) 6 million vaccinations.