During 2017, customers purchased gift cards from LatteBucks, all of which expire on December 31, 2019. At the end of 2018, some of the gift cards stll have not been redeemed. How should the unredeemed gift cards be reported on LatteBucks's 2018 year-end financial statements?

A. As a prepaid asset on the balance sheet
B. As a current liability on the balance sheet
C. As an expense on the income statement
D. As sales revenue on the income statement