Data regarding four products manufactured by Bunsen Labs are presented below. Direct materials and direct labour are readily available from the respective resource markets. However, the firm is limited to a maximum of 3,000 machine hours (mh) per month. Product A $15 $7 Product B $18 $11 Product C $20 $10 Product D $25 $14 Selling price per unit Variable cost per unit Units produced per mh The product that is most profitable for the firm in this situation is: 3 4 2 3 Product A Product B Product C Product D