问题补充：
Sixteen-year-oldsto drive.
A. is allowed
B. are not allowed
C. allowed
D. is not allowed
答案：
A. is allowed
(答案→)B. are not allowed
C. allowed
D. is not allowed
解析：句意：不许十六岁的孩子们驾车。结合语境可知本句主语为被允许的对象，故用被动语态。主语Sixteen-year-olds为复数形式，故选B。
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