what is the answer from 18 through 20 please

Question 18 An error in recording which item is NOT a counterbalancing self correcting error Not yet answered Points out of 3.00 Flag question Select one: O a. Treasury Stock purchase O b. Accrued Expenses O c. Prepaid Expenses Od. Year-end Inventory e. Accrued Revenues Which of these inventory changes would be accounted for retrospectively? Question 19 Not yet answered Points out of 3.00 Flag question Select one a. FIFO to UFO, but not UFO to FIFO Ob UFO to FIFO, but not FIFO to LIFO c. Both FIFO to LIFO and UFO to FIFO d. Neither FIFO to LIFO nor LIFO TO FIFO Which of these items would be accounted for retrospectively Questo 20 Not yet answered Points out of Rsg question Select one: a. Both new estimates for salvage values of depreciable assets, and changing methods of depreciation Ob New estimates for salvage values of depreciable assets, but not changing methods of depreciation c. Changing methods of depreciation, but not new estimates for salvage values of depreciable assets d. Neither new estimates for salvage values of depreciable assets nor changing methods of depreciation