The long run equilibrium point for perfectly competitive firms is:
Group of answer choices
A.at the bottom point of its average total cost curve; its price is equal to its average total cost there
B. at the point where average variable cost is at its lowest point and economic profits are positive.
C. at the point where average fixed cost is at its lowest point and economic profits are positive.
D. at the point where marginal cost is zero and economic profits are positive