Wagner Company sells Product A for $21 per unit. Wagner's unit product cost based on the full capacity of 200,000 units is as follows: Direct Materials $4 Direct Labour $5 Manufacturing Overhead $ 6 Unit Product Cost $ 15 A special order offering to buy 20,000 units has been received from a foreign distributor. The only selling costs that would be incurred on this order would be $3 per unit for shipping. Wagner has sufficient idle capacity to manufacture the additional units. Two-thirds of the manufacturing overhead is fixed and would not be affected by this order. Assume that direct labour is an avoidable cost in this decision. In negotiating a price for the special order, what should be the minimum acceptable selling price per unit? A) $14 B) $15 C) $16 D) $18