If the Demand Curve Is the Same as the Marginal

Multiple Choice

If the demand curve is the same as the marginal benefit curve and the supply curve is the same as the marginal cost curve,then the quantity at which they cross is
i.the equilibrium quantity.
ii.the allocatively efficient quantity.
iii.the quantity with no deadweight loss.

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