听力原文：W: Harry, you are an exercise physiologist by training, right？
M: Right.
W: So you can really tell us what we need to do here. Is this all about technology？ Is there so much technology, in our office that we don't even bother to walk across the room to talk to our colleagues？ Is that why we are gaining weight at our, at our cubicles？
M: Well, there are probably multiple variables that are causing this whole phenomenon. Eh, inactivity, obviously is the reason. Why are we inactive？ Over the last ten to twenty years, the faster and the more technology moves, the less we do.
W: Right.
M: While you used to get up, write a message and go see your colleague all the way across the office; now you spend 30 seconds, you write an e-mail zip, it's gone. You are onto the next thing.
W: Yeah.
M: Eh, so there are many reasons why we are less active even in the workplace. Problem is we are in such, we live in such an all-or-none society, that if people don't get 30 to 60 minutes of the formal exercise everyday, they give up.
W: Right.
M: So what's the use？ Why should I？
W: OK. So what are things people can do before or after work？ You know if they are trying to work as many hours as possible and also spend time with family and everything else, things they can do to help them at least get some exercise.
M: You know, if you commute uh, the New York City, take the bus or the subway, get off the stop earlier before you are supposed to, wherever you are supposed to get off.
W: Right.
M: Get off the stop earlier. That gives you a few extra blocks that you can walk.
W: Sure.
M: Eh, instead, if you are up on the 15th floor, I ant not gonna recommend you take the stairs for 15 flights. But you can take the elevator to the 12 floor and walk up 3 flights.
W: You know what, I've seen people who actually have been doing that way, who use the stairs all the time, makes a huge, huge difference.
M: Absolutely. It's just a matter of getting your 2 minutes here and there. It's a, overall, it all adds up.
W: And what should you do at lunchtime？ What about lunchtime？
M: Eh, be sensible. If you are moving less, you really require less energy. And you require less calories if you will.
W: Right.
M: So eat a little lighter, eat a little bit less, drink, eh, non-caloric fluids like water or even diet soda ff you are a soda drinker. And help that..., let that help you fill up.
Why do people nowadays become less active？

A. People are too lazy to do exercise.
B. People are more reliable on modem technology than on themselves.
C. People usually give up formal exercise.
D. People are too busy with their work and family.