Paragraph: 'Mandarin Chinese has four tones plus a neutral tone. The same syllable spoken in different tones carries entirely different meanings. For example, 'ma' can mean mother, hemp, horse, or scold. ___.' Which sentence best concludes this paragraph?
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A
Learning to write Chinese characters is also very challenging.
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B
Mastering tones is therefore one of the greatest challenges for non-native learners.
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C
Cantonese has even more tones than Mandarin.
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D
Many Chinese dialects are mutually unintelligible.