One item is omitted in each of the following summaries of balance sheet and income statement data for three different sole proprietorships, A, B, and C. Proprietorship A B Beginning of the Year: Assets $ 400,000 $ 150,000 $ 199,000 Liabilities 250,000 105,000 168,000 End of the Year: Assets 450,000 195,000 195,000 Liabilities 280,000 95,000 169,000 During the Year: Additional investment by the owner ? 79,000 80,000 Withdrawals by the owner 90,000 83,000 ? Revenue 195,000 ? 187,000 Expenses 170,000 113,000 185,000 Required: Determine the amounts of the missing items, identifying each proprietorship by letter