8. Peterson Photoshop sold $1,000 in gift cards on a special promotion on October 15, 2016, and sold $1,500 in gift cards on another special promotion on November 15, 2016. Of the cards sold in October, $100 were redeemed in October, $250 in November, and $300 in December. Of the cards sold in November, $150 were redeemed in November and $350 were redeemed in December. Peterson views the probability of redemption of a gift card as remote if the card has not been redeemed within two months. At 12/31/2016, Peterson would show a deferred revenue account for the gift cards with a balance of:

a.$0

b.$1,000

c.$1,350

d.$1,500

The answer is B, how?