Read the following excerpt from a short story.
'The old lighthouse keeper, Silas, polished the great lens until it shone like a captured star. For fifty years, he had been a fixture on this rocky outcrop, a solitary guardian against the sea's fury. He’d seen ships pass, seasons turn, and the mainland town sprout new buildings like mushrooms after a rain. Yet, his world remained the circumference of the light's beam. One evening, a young man from the town arrived, carrying a box of wires and circuits. 'It's all automated now, Silas,' he said, not unkindly. 'You can finally rest.' Silas looked from the intricate new device to the vast, darkening ocean. He had yearned for the town, for company, for a life beyond the waves, but as he handed over the keys, a profound emptiness echoed where the sea's roar used to be.'
Which of the following statements best expresses a central theme of the text?
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A
Technological advancement inevitably leads to progress and ease.
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B
The sea is a powerful and unforgiving force of nature.
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C
A person's identity and purpose can become intertwined with their responsibilities.
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D
True rest can only be found after a lifetime of hard work.