信函写作的7C原则 — 国际贸易选择题

某业务员起草的询盘函中写道：We are writing this letter to you in order to take this opportunity to inquire about your products, and we would be very grateful if you could possibly send us your catalogue. 该句主要违反了7C原则中的哪一项？ A. Completeness（完整） B. Concreteness（具体） C. Conciseness（简洁） D. Consideration（体谅）