Read the following passage:
'The old lighthouse stood on the cliff's edge, a solitary sentinel against the raging sea. For a hundred years, its beam had cut through the darkest storms, a steadfast guide for sailors. Though its lamp was now electric and its keeper long gone, the townspeople still spoke of it with a reverence usually reserved for ancient heroes. They said it had a spirit, one of resilience and unwavering duty.'
What is the main idea of this passage?
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A
The lighthouse uses an electric lamp.
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B
The lighthouse is a powerful symbol of strength and endurance for the town.
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C
The lighthouse keeper is no longer there.
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D
Sailors have relied on the lighthouse for a century.