A、Because Apple has made and played a lot of ads. B、Because they are getting smaller and smaller. C、Because they keep developing

W: It was just five years ago that the iPod first hit the market. Now wherever you go, you are sure to see those white ear buzzes. Steve, did Apple understand what it was launching five years ago?
M: Not really, it was after iPod came out that they realized everyone could enjoy this. Then they decided to extend it to the Windows platform, and millions of people took off with iPods.
W: What exactly has it brought?
M: It changed Apple from a company with a small market share with millions of computers to one with a massive market share in an incredibly important new product category.
W: Then iPod has completely changed Apple’s profile.
M: Right. People are now being driven from iPods to Apple’s computers as opposed to vice versa. They say, "This iPod is amazing. My whole music collections are with me. It’s so easy to use. I love it. "And they look at Apple’s software as well.
W: How many are being sold?
M: 67 million. It’s going to be 70 million pretty soon. I think next year it will hit 100 million.
W: That’s incredible. Do you think it is the peak or will it keep moving?
M: Keep moving. Take a look at the first iPods, they were sort of huge. They are getting smaller, and this year we’ve got even smaller.
W: I guess that’s the other thing about iPods. They are amazing, good in your hands, so user-friendly. They’re really imaginative.
M: Yeah, the more you use it, the more you become emotionally attached to it. You know what’s really changed? I don’t think Apple wants to do this. The music business world. On the iTune store, you can pick any song you like and buy it anytime you like.