Read the paragraph: 'Tai Chi is practiced worldwide for its health benefits. It improves balance, flexibility, and mental focus. Studies show it reduces stress and lowers blood pressure. ___.' Which sentence best completes the paragraph?
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A
However, many people find it difficult to learn.
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B
For these reasons, doctors often recommend it to elderly patients.
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C
It was originally developed as a martial art in ancient China.
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D
The movements are slow and require concentration.