Context: Humans have invented many ways to use energy from natural resources. Some of these uses of energy add to air pollution, and others do not.
Hint: Burning a material such as wood, oil, or coal releases chemicals that add to air pollution.
Below are three examples of using energy from natural resources. Select the use of energy that did not add to air pollution.
A. A torch burned natural gas, making a flame hot enough to melt glass.
B. The engine on a container ship burned fuel made from petroleum oil.
C. Wind moved a hang glider through the air.
Select the correct answer from the provided options and reply with the letter associated with it.

C