Sovereignty refers to the supreme and absolute authority of a state to govern itself without external interference. A sovereign state is one that possesses the final decision-making power over its territory and people, free from the control or direction of any foreign power.
The defining feature of a sovereign state is the independence of its government decisions. This means the state can formulate and implement domestic and foreign policies on its own terms, without being subject to the dictates of another state or external authority. Sovereignty does not require that power reside in the military, nor is it defined by freedom of speech (which is a civil liberty, not a component of sovereignty). Similarly, a constitution that can only be changed by the military describes a military dictatorship, not sovereignty itself.
The correct answer is that a sovereign state is one whose government decisions are made independent, because sovereignty fundamentally means self-governance and autonomous decision-making authority.