Practice Objective 5-5 Boots and Bags Ltd. reported a gross profit margin of 25% in 2018. Indicate which of the following items would result in an increase in the company's gross profit margin in 2019. O a. An increase in the number of boots and bags sold. O b. A decrease in the commission rate for selling each bag or pair of boots. O c. A decrease in the wholesale cost of bags. O d. A decrease in the number of customers paying promptly and not taking the company's 2% discount for paying in under 10 days. o e. An increase in the selling price of boots. o f. An increase in freight in costs. g. An increase in the wholesale cost of boots