Promote the rational flow and optimization of the allocation of production factors, achieve the complementarity of regional advantages, improve the overall development quality and efficiency, cannot do without a sound market mechanism, implement the overall strategy for regional development, and promote the coordinated development of regional economies. At present, two aspects should be emphasized: on the one hand, it is necessary to correct the distortion of factor prices, use price levers to guide the reasonable flow of various living factors, optimize the allocation of factor resources, and improve economic benefits. Into. What is the most appropriate summary of the central meaning of the above text? ['To promote the coordinated development of the regional economy, it is necessary to improve the market mechanism and promote the rational flow of production factors.', 'The price mechanism is an effective means of adjusting resource allocation.', 'A sound market mechanism is a sufficient condition for economic development.', 'Promote the rational flow of survival factors and optimize resources.']