A student reads: 'The old lighthouse had stood for over a century, its beam sweeping the dark waters every ten seconds. Sailors once feared the rocky shoals it guarded, but now only tourists visited.' What is the PRIMARY purpose of this passage?
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A
To warn sailors about dangerous rocks
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B
To describe how a lighthouse has changed in significance over time
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C
To explain how lighthouse beams work
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D
To persuade tourists to visit lighthouses