Read the passage and choose the correct answer for each question

Pollution is the process of making air, water, soil etc dangerously dirty and not suitable for people to use. For example:

Air pollution is where there are gases in the air that is harmful, these gases come from object or buildings like harmful smoke from factories, vehicles, automobiles. (cars, trucks, planes, boats) and many more.

Light pollution is unwanted light, such as the light of cities, street lights, and others makes it hard to see the stars.

Noise pollution is unwanted noise, such as the sound of cars in a city, loud boats/ship, airplanes, and trains.

Water pollution is where there are things in the water that are harmful such as crude oil spilled from a shipwrecked tanker, smoke, poison, air pollution, and a lot other things that are not human/plant/animal remains.

Air pollution comes from harmful _______ from factories, vehicles, etc.

• A. 
  trees
• B. 
  parks
• C. 
  smoke
• D. 
  liquid