I think should be allowed to drive.A. sixteen year oldB. sixteen-year-oldsC. sixteen year

问题补充：

I think should be allowed to drive.

A. sixteen year old

B. sixteen-year-olds

C. sixteen years old

D. sixteens year old

答案：

A. sixteen year old

(答案→)B. sixteen-year-olds

C. sixteen years old

D. sixteens year old

解析：在此，sixteen-year-olds表示的16岁的人，符合题意。