Which of the Following Sentences Handles Its Subject Most Positively

Which of the following sentences handles its subject most positively?

A) We regret to inform you that we cannot hire you at this time.
B) Although we cannot hire you now, we will let you know if there are vacancies in future.
C) Regretfully, we must turn down your request for employment.
D) Unfortunately, we have no job vacancies at this time.
E) Although all of our positions are filled, we will hold your application for a possible future opening.