I don't know what I did wrong. Can you please correct my wrong answers and explain them to me. Thanks so much!

Wang Company accumulates the following adjustment data at December 31 For each item, indicate the (1) type of adjustment (prepaid expense, unearned revenue, accrued revenue, or accrued expense) and (2) the status of the accounts before adjustment (overstated or understated). (Enter your answers in alphabetical order.) (1) Type of Adjustment (2) Accounts Before Adjustment Services performed but unbilled totals $600 (a) Assets Understated Accrued Revenues Revenues Understated Store supplies of $160 are on hand. The supplies account shows a $1,900 balance (b) Prepaid Expenses Assets Overstated Expenses Understated Utility expenses of $275 are unpaid. (c) Liabilities Understated Accrued Expenses Expenses Understated Service performed of $490 collected in advance (d) Unearned Revenues Revenues Understated Liabilities Overstated (e) Salaries of $620 are unpaid. Accrued Expenses Expenses Understated Liabilities Understated (f) Prepaid insurance totaling $400 has expired. Prepaid Expenses Assets Overstated