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.
E. The adjective clean is not parallel with the verb form paying.
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