Concept:A society is best understood as a network of social relationships formed by individuals and groups.
Explanation:The phrase "network of groups of people in an institution expressing human association" matches the definition of a society.
A society exists wherever people interact and maintain organised relationships.
A community is limited to people sharing a specific locality or close personal ties.
A nation refers to people united by common culture, history, or language.
A state is a political and legal entity with sovereignty over a defined territory.
Therefore, the description given in the question points to human association at a broad relational level.
Hence, the correct answer is option B.
Answer:B. society