Many states, in search of industries that are clean, fast-growing, and pay good wages to skilled workers, are trying to attract high-technology industries.
clean, fast-growing, and pay
clean, grow fast, and that pay
clean and fast-growing and that pay
clean and grow fast, paying
clean, fast-growing, and paying
C. Correct. Both clean and fast-growing are adjectives and are therefore parallel; they can correctly be conjoined by and. This choice creates a sentence with the relative clause that pay . . . workers. Notice that the sentence has another relative clause that are clean and fast-growing. This relative clause parallels the other one. Using and to conjoin these two clauses, each modifying industries, is logical and correct.
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