Read the following passage:
An increase in automobile use has led to increased
demand for fuel. The extraction, processing, and delivery
of fuel put harmful pollutants into the atmosphere. The
fuel that is then consumed by engines creates carbon
dioxide emissions. The carbon dioxide creates a
greenhouse effect in the atmosphere. The gasses trap
heat in Earth's atmosphere, leading to global warming.
What is one way the author uses a cause-and-effect structure to support his
purpose?
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A. By explaining the relationship between automobile emissions and
global warming
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B. By exploring the dangerous effects of air pollution on living things
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C. By listing several examples of how people can get around without
automobiles
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D. By explaining how gases trap heat in the Earth's atmosphere.