A large number of people in ward X of the city are diagnosed to be suffering from a fatal malaria type. Courses of Action: I. The city municipal authority should take immediate steps to carry out extensive fumigation in ward X. II. The people in the area should be advised to take steps to avoid mosquito bites.
A study of native born residents in Newland found that two-thirds of the children developed considerable levels of nearsightedness after starting school, while their illiterate parents and grandparents, who had no opportunity for formal schooling, showed no signs of this disability. If the above statements are true, which of the following conclusions is most strongly supported by them?