Which of the Following Is True

Multiple Choice

Which of the following is true?
i.In an unregulated market with an external benefit,consumers don't take it into account and consume less than the efficient quantity.
ii.Marginal social cost equals marginal private cost minus marginal external cost.
iii.An unregulated market produces more than the efficient quantity of a good with an external cost.

A) only i
B) only ii
C) only iii
D) i and ii
E) i and iii