Answer: c. Economically developed; economically developing
Explanation:
Economies that are doing fine in the society are giving a different measurement in requirements and enforcement than economies that are still finding their feet to get a stand. Policies that are used for economies doing well or improving are definitely different from that which is used for those still struggling.
The core of the earth is filled with molten rock, while for a little while as you dug the earth would be cool it would eventually become hot and molten.