The problem began simply enough. In the 1950s, plans to build a canal were abandoned due to political red tape. The
half-finished canal then became a dumping ground for
garbage. Chemical waste was deposited there and buried.
Two decades later, heavy rains and shifting soil caused
some of the chemical containers to leak. The chemicals
leached into the soil and contaminated the water supply.
Within months, the area had to be evacuated.
What is one way the author uses a chronological structure to support his
purpose?
A. By tracing the contamination problem over time
B. By detailing the order of events during the evacuation
C. By explaining that heavy rains lead to chemical leaks
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D. By comparing water pollution to land pollution