When Good a Is Produced,pollution Is Also Produced

Multiple Choice

When Good A is produced,pollution is also produced.When the marginal social cost of production of Good A equals marginal social benefit from Good A,then I.there is no pollution.
II.resources are used efficiently.

A) I only
B) II only
C) neither I nor II
D) both I and II
E) sometimes I and sometimes II,but never both simultaneously