The general ledger of Hug contains the following selected account balances: Appropriations Control $1,500,000 Expenditures 730,000 Reserve for Encumbrances 100,000 Vouchers Payable 90,000 Hug wants to order additional goods and services before the fiscal year end. What is the unencumbered balance of the budget that may be expended by Hug?

a. $580,000 b. $670,000 c. $1,310,000 d. $1,400,000