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 steamboat's engine burned coal.
B. A gas stove created an open flame for cooking by burning natural gas.
C. The Sun and wind dried clothes on an outdoor clothesline.
Select the correct answer from the given choices and respond with the letter of the chosen option.

C