【单选题】

With the average number of children in aBritish family falling beneath 2.0, the population of the UK has been falling for quite a few years. The size of theBritish workforce(劳动力)is becoming smaller and the average age of the workforce is rising. This trend is quite worrying for theBritish economy.

Why aren’t theBritish having as many children as they used to Well, there is a whole range of reasons. One of them is thatBritish people are now having at a much older age than before, meaning they have fewer years in which they can have chidren.After years of study at university, they then need a few years of work experience before they can get the job they want. They might then get married, but it’s very expensive to buy a house in the UK.
The above also explains whyBritish young people now don’t move out of their parents’ home until they are around 30 years old on average.It is not until they are 30 that they can afford to get married and start a new life in a new home. It’s only after this age that many young people start thinking about having a chilD、
Why doBritish young people live with parents till around 30
A、They can’t afford to buy a house.B、They haven’t got their children yet.
C、They have to look after their parents.D、They are used to living with their parents.