Correct option is A
Rudolf Stammler, a German jurist, introduced the concept that natural law is not absolute but variable, adapting to changing societal conditions.
Information Booster:
Stammler differentiated between formal and material natural law. He argued that while formal natural law offers universal principles of justice, its material content is relative, depending on societal circumstances.
Additional Information:
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(b) Del Vicchio: He contributed to the neo-Kantian theory of law, but his focus was on the formal characteristics of law, not the variability of natural law.
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(c) Finnis: John Finnis is known for modern natural law theory but did not specifically argue for the relativity of natural law as Stammler did.
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(d) Dabin: While Dabin contributed to legal philosophy, he did not propose the theory that natural law has variable content.