89. 下列書信內容屬何種函件？"It gives us great pleasure to introduce to you our latest bedding series. This latest series has been designed by our award -winning team keeping in mind comfort, style, and quality. You can visit o ur website at www.greatbedding.com to see for yourself the wide range we are offering." (A)offer (B)acknowledgement (C)enquiry (D)sales 。