Excuse me,could you tell me----?选择什么?为什么?

Excuse me,could you tell me____?选择什么?为什么?——Excuse me,could you tell me_________?A.how I can find the train station B.how I can get to the People's HospitalC.where is the supermarket D.where I can buy some fruit 为什么?为什么d是对的？a,c,d都是陈述语序啊，为什么用d呢？我不觉得A,C有什么不对啊？