Concept:Control accounts check the arithmetical accuracy of ledger balances.Explanation:A Sales Ledger Control Account shows the total owed by all debtors.A Purchases Ledger Control Account shows the total owed to all creditors.These accounts are prepared from totals in the books of original entry.They help to confirm that the individual debtors and creditors balances are correct.Therefore, their main purpose is to verify the total debtors and total creditors balances.Answer:C. verify total debtors and total creditors balances