_ should be allowed to do some sports after school in the afternoon.A.Sixteen-years-oldB.Sixteen-year-oldsC.Sixteen-year-old

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_ should be allowed to do some sports after school in the afternoon.A.Sixteen-years-oldB.Sixteen-year-oldsC.Sixteen-year-old

_ should be allowed to do some sports after school in the afternoon.A.Sixteen-years-oldB.Sixteen-year-oldsC.Sixteen-year-old
_ should be allowed to do some sports after school in the afternoon.
A.Sixteen-years-old
B.Sixteen-year-olds
C.Sixteen-year-old

_ should be allowed to do some sports after school in the afternoon.A.Sixteen-years-oldB.Sixteen-year-oldsC.Sixteen-year-old
b

B
A的表达形式是错的;C是形容词,做前置定语。