Given the following for the Whittier Company: Freight-Out $6,000 Sales Revenue 80,000 Inventory, January 1 15,000 Inventory, December 31 12,000 Freight-In 4,000 Bad Debt Expense 2,000 Purchases 38,000 Sales Returns and Allowances 1,500 Interest Revenue 5,000 Cost of Goods Sold is: O a. $45,500 O b. $39,000 Oc $45,000 O d. $43,500 $41,000 Oe