April 15 Bryan Walker 34680 Hoover Road St. Paul, Minnesota 039523 U.S.A. Dear Mr. Wa

April 15 Bryan Walker 34680 Hoover Road St. Paul, Minnesota 039523 U.S.A. Dear Mr. Walker, I am writing this letter to confirm Mondays telephone conversation about the purchase of the XB3000 Laser Printer and to thank you again for the invitation to take part in the Continental Project in Toronto. I appreciate your thinking of me. I found out today that I will be in Middleton City on Tuesday, May 3rd. If it works for you, I could meet you in Vancouver either on the morning of the fourth or the fifth. It would be an excellent opportunity to work out the details of the ad campaign in Boston. Ill be staying at the Hillside hotel on Madison Street until the sixth. Im hoping that Melissa Baily will be able to join us. Did you know that she won the competition for the "Best Advertisement" this year？ Her experience would be invaluable for the Continental Project. I look forward to working with you again. Sincerely, Robin Evans Marketing Manager, TNT International

What is the purpose of the letter？

A．To complain about the shipment

B．To express appreciation and confirm a call

C．To invite Mr. Walker to take part in the Continental Project

D．To order a new laser printer model

请帮忙给出正确答案和分析，谢谢！