1. PART A: Which statement identifies the central idea of the text? A. Children are less likely to be harmed by air pollution when they live in a city. B. Air pollution can cause people to develop mental and physical health problems that could become more serious over time. C. Air pollution is not a concern for children because their bodies and minds are young and strong. D. While air pollution has a serious impact on children and adults’ health, there is much people can do to protect themselves against the invisible threat.