In Which of the Following Situations Can an Agency Relationship

In which of the following situations can an agency relationship be created?

A) X hires Y to buy some property on X's behalf
B) X makes an oral agreement that Y will work for X's company as the company's general manager
C) X and Y enter into a written agreement that Y will work for X as the general manager of X's company
D) X hires Y to buy some property on X's behalf and X makes an oral agreement that Y will work for X's company as the company's general manager
E) X hires Y to buy some property on X's behalf and X makes an oral agreement that Y will work for X's company as the company's general manager and X and Y enter into a written agreement that Y will work for X as the general manager of X's company