Final answer:
Customers redeemed $13.8 million in iTunes gift cards in December. This is the amount redeemed and not the total sold by Bananas, which was $20.8 million.
Step-by-step explanation:
The student asked how much customers redeemed in iTunes gift cards in December. To find the answer, we should look at the amount that was redeemed, not what was sold. Bananas sold $20.8 million in gift cards, but customers redeemed $13.8 million. Therefore, the correct answer to how much customers redeemed is $13.8 million, which is option B.