单项选择题

Attitudes to leisure have been much influenced by the modern love of moving around and by the ease of travel.
The British enjoy the family outing. Most people choose well-known beauty spots, or seaside beaches. Others choose a lonely place, where there are very few people. They may follow tracks between the mountains and lochs and watch seals and seabirds.
Food in British hotels and restaurants is reasonably cheap, but hotel rooms are not. The English people rent house or flats for their holidays, but one of the traditional ways of spending a summer holiday is in a boarding house. A house like this may have a card in its window advertising bed and breakfast. In seaside towns there are whole streets of houses, almost every one of which has such notice in window.
In recent years several new holiday habits have developed. Among them; the most interesting one is the growth of the so-called holiday camps. They consist usually of great numbers of small, and often quite comfortable, suburban houses, together with central dining halls, dancing halls and swimming pools. Camping holidays with tents are not so well developed in England as in France. The summer weather too often can be very unpleasant for tent-dwellers.
Why do English people rent house or flats for their holidays

A.Because it is an important tradition.
B.Because there are too many houses for rent.
C.Because hotel rooms are quite expensive.
D.Because they have no other choices.