What did i do wrong and what am i missing?

Posting errors are identified in the following table. In column (1), enter the amount of the difference between the two trial balance columns (debit and credit) due to the error. In column (2), identify the trial balance column (debit or credit) with the larger amount if they are not equal. In column (3), identify the account(s) affected by the error. In column (4), indicate the amount by which the account(s) in column (3) is under- or overstated. Item (a) is completed as an example. (Select "None" if there is no effect.) x Answer is not complete. Difference Column Identify Description of Posting Error between Debit with the Account(s) Amount That Account(s) Over- or and Credit Larger Incorrectly Understated Columns Total Stated a $3,600 debit to Rent Expense is posted as a $1,340 debit. 2,260 Credit Rent Expense Rent Expense is understated by $2,260 b $6,500 credit to Cash is posted twice as two credits to Cash. 6,500 Credit Cash Cash is understated by $6,500 $10,900 debit to the Dividends C. account is debited to Common $ 0 None Common stock V Common stock account is understated by Stock. $10,900 $2,050 debit to Prepaid Insurance d. is posted as a debit to Insurance $ 0None Prepaid Prepaid insurance is understated by $2,050 Expense. insurance Insurance expense Insurance expense is overstated by $2,050 $38,000 debit to Machinery is posted as a debit to Accounts $ 0 None Machinery Accounts payable is understated by $38,000 Payable. Accounts payable Accounts payable is understated by $38,000 X $5,850 credit to Services f. Revenue is posted as a $585 5,265 Debit Services revenue @ Services revenue is understated by $5,265 credit. $1,390 debit to Store Supplies is not posted $ 1,390 Credit Store supplies Store supplies is understated by $1,390