All the following sentences have an appositive EXCEPT______A．You are John Estes, the telep

All the following sentences have an appositive EXCEPT______

A．You are John Estes, the telephone engineer, aren"t you？

B．My friends all understand me.

C．I have no idea when she will come back.

D．I told John, who told his brother, and he told his wife.

请帮忙给出正确答案和分析，谢谢！