Which of the Following Is a Good Example of a Physical

Which of the following is a good example of a physical hazard to public health?

A) In much of the United States,mosquitoes are known to transmit West Nile Virus to people.
B) The use of condoms is known to reduce the risk of most sexually transmitted diseases.
C) An earthquake kills more than 200,000 people in Haiti and destroys countless homes,roads and buildings.
D) Levels of mercury in some lakes result in dangerous levels in the meat of fish.