Which of the Following Definitions Refers to the State System

Which of the following definitions refers to the state system?

A) The condition that many of the most important actors in international relations are states, which can be understood as systemically linked to one another
B) A state that aims to provide a basic safety net for the most vulnerable elements of its population
C) States' efforts to shape the economic performance of their societies, especially in fiscal and monetary policy
D) The process through which states are constructed out of other kinds of polities, or by which state capacity is increased.