Signs can been seen on the road._____ can people see them?

题目

Signs can been seen on the road._____ can people see them?
A.Where else place B.Where place else C.Where else D.Anywhere
(说答案和为什么,可以的请翻译.)

答案

D是副词,绝对不能选
where是疑问副词,不能修饰place,
所以只能选C