TOEFL Reading: ETS-TOEFL阅读机经 - JZR193547OJS5T83L$

Which of the following is NOT mentioned in paragraph 3 as a reason that agriculture led to greater exposure to disease? A. Irrigation created areas where disease-carrying mosquitoes could reproduce. B. People increasingly came into contact with disease-carrying animals attracted to food storage areas. C. Agricultural products spoiled more readily, leading to more frequent episodes of disease. D. Farming exposed humans to disease-carrying insects in the soil.