【已刪除】下列書信內容屬何種函件?"Our ag e nts in Br ussels h a ve asked us for quotations for 30,000 decorative teapots to be exported to Belgium. Please let us know what quantities you ar e able to deliver at r egular inter vals, quoting your best ter ms f.o .b. A ms t erd am." (A)inq u ir y (B)off er (C)counter-offer (D)order