The Rational Rule for Society Says That More of a Good

The Rational Rule for Society says that more of a good should be produced:

A) if the marginal social cost is greater than the marginal social benefit.
B) as long as the total social benefit exceeds the total social cost to everyone.
C) if the rational external benefit exceeds the rational external cost.
D) as long as its marginal social benefit is at least as large as the marginal social cost.