97. 下列書信內容屬何種函件？"I would like to explore the possibility of doin g business with you in the future. However, that will not occur if I am to e xpect this type of product. Surely, my unfortunate experience is not in alig nment with your reputation, which I hear is of high caliber." (A)offer (B)co mplaint (C)apology (D)sales promotion 。