Here is a summarized income statement of a firm - Sentech. The manager of Sentech is required to manage gross profit margin more effectively to grow the business. The gross profit margin shows the percentage ratio of revenue you keep for each sale after all cost of goods sold are deducted. All of the following will allow Sentech to improve the margin EXCEPT a. Mitigating vendors' bargaining power b. Mitigating buyers' bargaining power c. Mitigating capital providers' bargaining power d. Achieving economies of scale