Which of the Following Openings Is Most Appropriate for a Claim

Multiple Choice

Which of the following openings is most appropriate for a claim message?

A) For the past four years, we have held our annual banquet at your fine restaurant.
B) On January 31 a number of our employees attended a banquet at your restaurant.
C) Please process a refund for $68 to reimburse us the amount we were overcharged for our banquet.
D) We were extremely upset to learn that we were charged too much for our banquet .