A、Because their homes are too far from their companies. B、Because they are not allowed to leave the office. C、Because they don’t

Most people who work in London get a break of about an hour for lunch. As they most live too far from home to go bark for lunch, they have to make other arrangements for their midday meal.
    Many large companies have a canteen designed for their employees. In such canteens the food served is simple but adequate and although there are a variety of choices, the number of dishes is small. The employees themselves fetch their dishes from a counter at which they are served.
    As there are so many people at work in London, there are numerous cafes and restaurants in every area that is not purely residential. A meal may cost anything from a modest sum to quite a few pounds, depending on the restaurant and the food chosen. Moreover, one can generally get a meal, or at least a snack, in a pub. A number of well-known caterers run popular cafes in practically every district of London. In many of these cafes there is self-service—there are no waiters or waitresses.
    Many employees do not bother to go out to lunch. They bring their own sandwiches, and perhaps an apple or bread, with which they have a cup of tea, probably made in the office. This method has the advantages of being cheap and saying time in getting to a restaurant and queuing up there. In summer, many people go out and sit on a bench in a park or public square, and eat their sandwiches there. They are often able to listen to lunch-time concerts and plays, too.