When making a reference check, the key question which a sales manager should ask an applicant's former employer is:

Question $17$ options:

A$.$ Was he $($or she$)$ a good worker?

B$.$ Did he $($or she$)$ cause any problems in your firm?

C$.$ Was he $($or she$)$ well liked by fellow workers?

D$.$ Was he $($or she$)$ a good worker?

E$.$ Would you rehire him $($or her$)?$