At the current level of output, the marginal social benefit from a slice of pizza is less than the marginal social cost of producing a slice of pizza. Resources will be used more efficiently if _____...

At the current level of output, the marginal social benefit from a slice of pizza is less than the marginal social cost of producing a slice of pizza. Resources will be used more efficiently if _____ slices of pizza are produced and ______ other goods are produced.
a. fewer; fewer
b. more; more
c. more; fewer
d. fewer; more