The correct option is D Better for economic and cultural progress
A federal structure envisions a balance between local autonomy and national unity. The distribution of powers helps check the despotism of the central government, and also leads to administrative efficiency. Many bigger countries prefer the federal system. Without proper delegation, it would become impossible to administer the whole country. This is also better for economic and cultural progress as each local government can make policies that suit the region and meet the needs and aspirations of the people within it.