For monopolistically competitive firms in long-run equilibrium:
A.
the demand curve must intersect average total cost at its minimum.
B.
the demand curve must be tangent to the average total cost curve at its minimum.
C.
at the profit-maximizing quantity, the demand curve must intersect the average total cost curve quan
D.
at the profit-maximizing quantity, the demand curve must be tangent to the average total cost curve.