A) The condition which occurs by rising levels of globin inside the blood is called methenaglobinmia. This is due to the presence of 2000 ppm of nitrates in drinking water. B) The presence of 1000 ppm of lead in potable water damages kidney. C) The presence of 50 ppm of fluoride in drinking water damage bones and teeth. D) The growth of fish can be stopped if the presence of dissolved oxygen becomes less than 1 ppm. Therefore, A - IV , B - II , C - V , D - I