Writing "Thank You in Advance" at the Close of a Routine

Multiple Choice

Writing "thank you in advance" at the close of a routine request

A) is courteous and effective.
B) will guarantee a positive response.
C) is best to avoid,since many people find it presumptuous.
D) is most effective when you end the statement with an exclamation point.
E) is expected when your audience is unfamiliar.