Answer:
The correct option is $750,000
Step-by-step explanation:
A county uses the modified accrual basis of accounting for revenue and expenditure which implies that revenue and expenditure do not show up in the county's books of accounts except for those ones actually received and paid in the period under consideration.
As a result,the expenditures for the debt service year are those actually paid which comprises of the principal repayment of $600,000 and interest payment of $150,000,totalling $750,000($600,000+$150,000)