A company sells four products, as follows: Product A: Price per unit: $120; Variable cost per unit: $60; 3 machine hours required. Product B: Price per unit: $90; Variable cost per unit: $40; 2 machine hours required. Product C: Price per unit: $80; Variable cost per unit: $30; 5 machine hours required. Product D: Price per unit: $70; Variable cost per unit: $30; 1 machine hour required. The scarce resource in the company is machine hours. Which product should the company emphasize in its marketing campaign?