Dear Mr. Jason, We are glad to offer you employment as an assistant in Legal Service Department. We trust your academic knowledge, English skills and overseas experiences. Should you accept this job offer, you will be able to receive RMB 8,000 per month. New employees will have new employment orientation held at our Group Headquarters at 9:00 am. on the 15th of July. We hope that you will accept this offer. Please send and date this Job Offer Letter as soon as possible. If you have any questions or concerns to discuss further, please feel free to contact me. Yours sincerely, Mary BrownThe letter that Mr. Jason got is ________.
选项：

A:a letter of complaint
B:a job application
C:a job offer