Which of the Following Is the Most Effective Closing Statement

Multiple Choice

Which of the following is the most effective closing statement for a routine request message?

A) Thank you in advance for answering all my questions about your training workshops.
B) I would appreciate receiving your price list by November 3 so I can plan for a purchase in my December budget.
C) Please send me background information about your new product line.
D) I trust that, if you want me to order merchandise from your company, you will respond by June 30.
E) I am in the process of planning a wedding reception and need some assistance.