The correct answer is (b), Austin.
Austin was a 19th-century English jurist who is considered one of the founders of legal positivism. He argued that law is a command of the sovereign, and that international law is not law because it is not enforced by a sovereign.
Bentham was an English philosopher and jurist who is considered one of the founders of utilitarianism. He argued that law should be based on the principle of utility, which is the greatest good for the greatest number of people.
Savigny was a German jurist who is considered one of the founders of historical jurisprudence. He argued that law is a product of the Volksgeist, or the spirit of the people.
Holland was a Dutch jurist who is considered one of the founders of analytical jurisprudence. He argued that law is a system of rules that are created by the state and enforced by the courts.
In conclusion, Austin is the only one of the four jurists who argued that international law is not law.