Could you help me in solving this question, Doctor, as soon as possible, please, and thank you.

on Company XYZ is specialized in producing and selling smart watches. The company currently has two products and is planning to improve it profits in the coming years. The company is thinking of introducing a sales commission to encourage its sales people to make more sales and improve company's profitability. When designing the sales commission the company should base the sales commission on: of O a. The color of the product O b. The selling price O c. The number of employees O d. The contribution margin O e. None of the given answers