Concept:The sales ledger control account summarizes the total amount owed by credit customers at a point in time.Explanation:The sales ledger control account is also called the trade debtors control account.It records all credit sales, cash received from debtors, and sales returns.The closing balance of this account shows the total amount still owed by customers at the end of the accounting year.This balance is reported as trade debtors on the balance sheet.Answer:A. trade debtors at the end of the year