Answer: B
Analysis:
满族 (Mǎnzú): Manchu.
大和族 (Dàhé zú): Yamato.
蒙古族 (Ménggǔ zú): Mongolia nationality.
汉族 (Hànzú): Han nationality.
The ”大和族 (Dàhé zú) Yamato” is Japan’s leading group, accounting for the largest share of Japan’s population. In fact, about 98% of the country’s inhabitants are Yamato ethnic groups. So, the answer is B.