题目内容：
Questions refer to the following letter.Toppo Travel. Inc.
Mr. Boyce Adams
424 Lenox St
Orange, MA 01388
Dear Mr. Adams,
At the end of this year, Toppo travel will celebrate its twentieth year as a successful operator in the leisure industry. With modem hotels, exciting itineraries, and beautiful loeations, our all-inclusive, organized tours have remained the most loyal customers in the celebration of our success.
Our records indicate that since you became a customer five years ago, you have booked six trips with us. We would therefore like to invite you to an evening of exotic fare and tropical sounds, which will be held on December 1 in the Grand Ballroom of the Panorama Hotel.
The benefit will consist of delieates from the 16 countries that are featured in our catalog for the new season. Bans from Cuba, Mali, and Slovenia will lend an exuberant atmosphere to the event.
Sincerely,
Jim Bull
Director Customer Relations
Toppo Travel, Inc.
To what event has Mr. Adams been invited? A．A hotel's grand opening
B．A retirement dinner
C．An anniversary celebration
D．An awards ceremony
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