Concept:Adjusted cash book balance is found by updating the cash book for items not yet recorded in it.Explanation:Start with cash book balance: #5,000.Subtract dishonored cheque: #5,000−#1,000=#4,000.Add direct credit: #4,000+#800=#4,800.Subtract direct debit: #4,800−#500=#4,300.So, the adjusted cash book balance is #4,300.Answer:B. #4,300