I would say D, since A and B would be highly irrelevant. C sounds like a possible answer, but could still be viewed as irrelevant since it doesn't actually contain info about MP3 players.
Answer:
Skiff Miller wanted to take the dog back and go to Alaska with him, but to do this he would have to take it from the couple that took the dog in and took good care of it. Skiff Miller must have gotten attached to the dog and felt a sense of love, he believed he was the better owner and that the dog wanted to be with him more than the couple because he raised the dog like he was its mother. That's all I remember from the book, hope it helps :) :)
Explanation:
This is True. Character interaction, even the most basic ones, can help us understand a hidden story or the lack of one in their lives.