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 pellet stove burned pellets made from wood.
B. An airplane's engines burned jet fuel made from petroleum oil.
C. Wind moved a sailboat across the water.
Answer with the option's letter from the given choices directly.

C