Who wrote the book 'Concept of Law'?

Correct option is D

"The Concept of Law" was written by H.L.A. Hart and published in 1961. It is one of the most influential works in modern legal philosophy and forms the cornerstone of the Analytical School of Jurisprudence. Hart developed the idea of law as a system of "primary rules" (duties) and "secondary rules" (rules about rules, like rules of recognition, change, and adjudication). He distinguished law from morality, but accepted that moral criticism of law is important.

Information Booster:

Primary Rules: Oblige individuals to behave in certain ways (e.g., rules against violence).
Secondary Rules: Govern how primary rules are created, altered, or identified.
• Rules of Recognition
• Rules of Change
• Rules of Adjudication

Hart criticized the "Command Theory" of John Austin and introduced a more nuanced analysis of legal systems.
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Additional Information:
H.L.A. Hart’s work greatly influenced later theorists like Ronald Dworkin, who challenged Hart's views in "Taking Rights Seriously".