The correct answer is: D) Respioratory and heart disease related to air pollution are the leading causes of death in China.
The World Health Organization (WHO) states that air pollution is the world's largest single environmental risk, only in 2012 it caused around seven million deaths around the world. This organization has made several research and concluded in a document titled Air Pollution & it's Health Effects in China that there is a significant correlation between air pollution and mortality in the chinese urban areas. From the total number of people deceased, there was 17% in those urban areas that were caused by air pollution.
Air pollution increases pneumonia mortality in children under 10 years of age; in ederly persons it causes chronic obstructive pulmonary desease as well as lung cancer.