Answer:
D. A state is a political unit with people who live in a defined territory.
Step-by-step explanation:
A state, often referred to as a nation state for disambiguation purposes, is a political unity or entity that, under a same and unified form of government (democracy, tyranny, monarychy, etc.) governs a defined and settled group of people, often of the same ethnicity —though ideally also considering other ethnic minorities and immigrants—, under territorially established land.