Unearned Revenue, which represents the company's obligation to honor gift cards previously issued to customers, totaled $5,500 at the beginning of the year and $7,500 at the end of the year. Customers purchased gift cards amounting to $42,000 during the year. What was the amount of gift cards redeemed by customers during the year?

A.$40,000B.$44,000C.$55,000D.$29,000