The English School’s theory of International Relations is posited on several sets of principles. The first of these sets relates to the three kinds of order always influencing the world simultaneously.

• The first is the International System or social order ; this is about power politics.
• The second is International Society or order between states in a system or society of states.
• The third is World Society_from Kantian philosophy regarding the liberal aspects of the state system.

As also understood from the information given, the correct answer is D. The information given in the fourth option is related to neorealism. There are two basic principles underlying neorealism:

• First, the international system’s ordering principle is anarchy: there is no such thing as a world power superior to states. This results in an international system that is essentially a self-help system, with autonomous states that are functionally similar actors, each of which must always be prepared to defend or protect itself.  
• The second defining principle of the structure of international politics is the distribution of capabilities (power) across the units inhabiting the international system.