He sister is ( )than he A.younger five years B.five years younger C.five year younger

题目

He sister is ( )than he A.younger five years B.five years younger C.five year younger
D.five younger years

答案

B.
不过你的问题就写错了.应该是Her sister is five years younger than her. 或者His sister is five years younger than him. He是主语,不是宾语（him)或所有词(his).