In recent years, great progress has been made in the development of preschool education for urban and rural children in China. However, the problem of "difficult to enter a kindergarten" for rural preschool children has not been completely solved. The problem of "difficult to enter a kindergarten" for children cannot be relied on to use school buses to pick up children, "reasonable layout, enter the nearest park" is fundamental to ensure the safety of children and solve the difficulty of entering the park. If the above is true, which of the following is the most supportive of the above argument? ['National financial investment in rural pre-school education as a percentage of national education investment continues to increase.', 'School buses purchased in accordance with international safety standards have high maintenance costs, and children in some areas cannot afford them.', 'Each township should plan and build a public kindergarten, a large village independently run a park, a small village jointly run a park.', 'The state recruits preschool teachers for free orientation training, and returns to the local preschool education after graduation.']