Answer:
Option B.
Dr Bad Debt Expense 8120
Cr Notes Receivable 8120
Explanation:
The liability was of $8000 which excludes the interest income of 9% on it which is for 2 months.
So the total liability = $8000 + $8000*9%*2/12 = $8120
The double entry would include the decrease in the note receivable and increase in the bad debts expense with the same amount. So the entry is as under:
Dr Bad Debt Expense 8120
Cr Notes Receivable 8120
Hence the correct option is Option B.