A reading passage discusses Chinese character evolution: '汉字从甲骨文发展到现代简体字，经历了几千年的演变。' What does this passage describe?
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A
The invention of Chinese pinyin romanization system
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B
The thousands of years of evolution from oracle bone script to modern simplified characters
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C
The differences between Mandarin and Cantonese writing systems
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D
How Chinese characters were adopted by Japan and Korea