Read the passage below then pick out ONE best option (A, B, C or D . to complete each of the following sentences:

Britain is now a highly industrialized country and there are only 238,000 farms in the UK. More and more farmers leave the land because they can not earn enough money to survive. Only large farms are economic and because of this most British farm are big. They usually grow cereals in the east of England and raise sheep and cowsin the north of England and Scotland. The small family farms often have to earn more money by offering bed and breakfast accommodation to tourists.Farming methods in Britain have also changed. Fields used to be quite small, divided by hedges which were sometimes a thousand years old and full of wild flowers and birds. Many hedges were pulled up to allow farmers to use mordern machinery. Now most fields in England are large by European standards

 

British farmers give up working on their farms because________ .