他偶然发现了一种天然杂交水稻，它比其他水稻有明显的优势。

他偶然发现了一种天然杂交水稻，它比其他水稻有明显的优势。
A.He seemed to find a natural hybrid rice plant that had obvious disadvantages over others.
B.He happened to find a natural hybrid rice plant that had many advantages over others.
C.He happened to find a natural hybrid rice plant that had obvious advantages over others.
正确答案：He happened to find a natural hybrid rice plant that had obvious advantages over others.