In today's society, many elderly people drift into foreign countries to become "Lao Diao people" in order to help their children take care of the next generation. In a recent urban survey, the young people interviewed admitted that their parents are Lao Diao people, and their loved ones have just started Due to the pressure of work, there is no time to take care of children and do housework. According to some experts, the Lao drift group in Chinese cities will further expand. Which of the following, if true, would best support the views of these experts? ['Older people can have better medical conditions in rural areas than in rural areas.', 'Some elderly people are entangled in home affairs and are more willing to live in their hometown.', 'The implementation of the national two-child policy will promote more children to be born.', 'After the implementation of the two-child policy, the second-child birth rate in urban areas is lower than in rural areas.']