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18. 밑줄 친 부분 중 어법상 가장 적절한 것은?

A print was a ①historicalimportant method of producing images on paper, both in artistic printmaking, and also for commercial reproductions and illustrations for books and magazines. It ②has long replacedby photography in its commercial applications and is much less common in printmaking. A print is the practice of carving a design into a hard, usually flat surface, ③by cutdeep lines into it. A ④hardenedsteel tool called a burin ⑤is used to cuttingthe design into the surface, most traditionally a copper plate.