<u>Answer:</u>
<em><u>a. most people are unaware of how air pollution affects the environment.</u></em>
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<u>Explanation:</u>
The passage provided describes how automobile usage increases the need for fuel and how the process of securing and supplying fuel damages the air, which, in turn, damages the environment. The author of the passage describes this specific topic with an appropriate amount of detail that educates the reader. This points to the rational conclusion that the main idea of this passage is to inform the reader on said topic.
<em><u>Here are some quotes from the passage to support this:</u></em>
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<em>· "</em><em>An increase in automobile use has led to increased demand for fuel."</em>
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<em>· </em><em>"The extraction, processing, and delivery of fuel put harmful pollutants into the atmosphere."</em>
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<em>· </em><em>"The gasses trap heat in Earth's atmosphere, leading to global warming."</em>
