Concept:A quotation is a statement of prices sent by a seller to a potential buyer.
After receiving it, the buyer responds by placing a formal request for the goods.
Explanation:The seller sends a quotation listing the prices of goods or services.
The recipient, who wants to buy, then communicates the exact items and quantities required.
This formal request from the buyer to the seller is called an order.
An advice note, invoice, or cheque are issued at later or different stages.
Therefore, the expected response to a quotation is to send an order.
Answer:D. an order