Can you tell me ______?

A. what's the matter with him                             B. what the matter with him is
C. what happened with him                                D. what with him happened

Let me tell you ______.

A. how much is the car                                   B. how much does the car cost
C. how much did I pay for the car                        D. how much I spent on the car

正确答案是AD，请详细分析　宾语从句中的语序，谢谢