It's not A or B because neither have any effect on air pollution. Air conditioners or heaters just change the temperature of the air by filling the room in. Products being reused or disposed makes no difference on air, although it can make a big impact on whether the environment stays green so to speak.
The answer is C.
Hazardous waste are different. They are dangerous, suffocating, and irritating. They are pretty much chemicals that people should be careful of using. It's even worse if it's not disposed of properly. The name hazardous itself explains the danger. It is something that can pollute the environment if not taken care of properly.
The answer is: A great way to cool food is to constantly stir the food
Fomites are objects that can harbor diseases and can spread infection. It usually has route which is oral or direct contact. Examples can be the clothes we are wearing, utensils, etc. In the this case, letter C is the answer which is then the remote control for TV in the doctor's office waiting room since someone who is sick like having colds can then touch the remote control and pass the bacteria then to it by sneezing thus it carries the germs and another can then touch the remote control and get colds as well thus spreading the infection.
