The balance in the prepaid rent account before adjustment at the end of the year is $13,656, which represents 12 months' rent paid on December 1. The adjusting entry required on December 31 is Oa. debit Rent Expense, $12,518, credit Prepaid Rent, $1,138 Ob. debit Prepaid Rent, $12,518, credit Rent Expense, $1,138 Oc. debit Rent Expense, $1,138, credit Prepaid Rent, $1,138 Od debit Prepaid Rent, $1,138, credit Rent Expense, $1,138