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17. In Passage B, it can most reasonably be inferred from the third paragraph (lines 74–79) that “centers of crop diversity” become crucially important when:
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A. plant breeders would like to learn more about the plant species of central Asia.
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B. problems with a cultivated crop require experts to research a new variety of the crop.
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C. consumers would like more variety in grocery produce departments.
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D. disputes among plant breeders, pathologists, and entomologists lead to a reduction in crop variety.