he was the first one in the history of the US to win that prizeA.fifty-years B.fifty-year C.fifty years D.fifty year

he was the first one in the history of the US to win that prizeA.fifty-years B.fifty-year C.fifty years D.fifty year
he was the first one in the history of the US to win that prize
A.fifty-years B.fifty-year C.fifty years D.fifty year

he was the first one in the history of the US to win that prizeA.fifty-years B.fifty-year C.fifty years D.fifty year
B答案
he was the first one in the (fifty-year) history of the US to win that prize.
他是美国那50年来第一个获得那个奖项的人
50年的历史,fifty-year history,
或者 fifty years' history 就是说C 答案要加个 撇" ' "

他是美国历史上第一个赢得那个奖项的人