Three friends, Ms Raja, Ms Omar and Ms Beatty all live in the same street. They are a doctor, an engineer and a musician in some order. The youngest one, the doctor, does not have a brother. Ms Beatty is older than the engineer and is married to Ms Omar\textquotesingle s brother. What are the names, in order, of the doctor and the engineer? 
选项为:A:Raja and Omar  B:Omar and Beatty  C:Beatty and Omar  D:Raja and Beatty  E:Omar and Raja  请回答其中一个选项.