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The first paragraph describes how Becker projected economics into non-market domains like crime and domesticity, analyzing them with economic tools. It also states that he did not borrow ideas or perspectives from fields such as anthropology or history. Option c aligns with this.
Option a: The passage mentions that Becker applied economic principles to non-market phenomena like crime and domesticity, but it does not state or imply that he benefitted from this.
Option b: The passage explicitly contradicts this idea, stating: “At the same time, he did not let other ways of thinking enter his own economic realm: for example, he did not borrow from anthropology or history.” Becker did not borrow from other disciplines, so this option is incorrect.
Option d: The passage does not state that Becker actively guarded economics against outside influence. Instead, it focuses on Becker’s one-sided application of economics to other areas, without accepting external perspectives.
Hence, option c is the correct answer.