Figure 4 The vertical distance between points A and B represents a tax in the market. T Price 22 * 20 + 18- A Supply 14+ 12 + 10 - - 8- 6+ B Demand 2 100 200 300 400 500 600 700 800 900 1000 Quantity 40. Refer to Figure 4. When the tax is imposed on sellers in this market, buyers effectively pay what amount per unit of the $10/unit tax? A. $0 B. $10 C. $4 D. $6