請依下文回答第 46 題至 50 題 People are working to an older age in Britain. The number of 70-74 year-old people who work has doubled in the past decade. Around 10% of British people in their early 70s are now working. It is the highest figure since records began. The British government says just over a quarter of a million 70-74-year-olds currently have jobs. In 2005,there were around 100,000 of them. The government said people are working to an older age and are deciding to retire later. A labor union spokesperson said the reason for people working in their old age is because retirement pensions in Britain are becoming more difficult to live on. Many older people have to work and delay retirement to be able to survive.
Employment spokesman Frances O'Grady said, “The last decade has seen [big] changes in the labor market, with far more people working beyond retirement age. While there are plenty who enjoy remaining in work, many need to earn extra cash because they cannot afford to retire.” He added that, “We need decent jobs and pensions for all so that people can make a   genuine choice   about whether they remain in work.” A spokesman for small businesses, John Allan, said more older people were starting their own businesses. He said, “More and more older people are [deciding on] a career change later in life and are starting up their own businesses, pursuing something they may have dreamed of doing for years.”
【題組】46 What is this passage mainly about?
(A) The dream jobs and small businesses for senior citizens.
(B) The government's pension policies for retired citizens.
(C) The new retirement plans of the British labor union.
(D) The phenomenon and reasons of older people working.