A sale _____ is a transaction where the buyer is permitted to use goods for a period and then return them if they do notmeet the buyer's needs or expectations even though the goods are not defective.

錯誤選項解析

• ① on consignment:寄售交易 (sale on consignment) 是指貨物所有權仍屬寄售人，由代銷人代为銷售，售出後才移轉所有權並結算貨款，與買方試用後可退還的機制不同。
• ③ upon request:upon request 僅表示「依要求」或「經請求時」，屬於一般商業用語，並非特定的貿易交易條件或買賣契約類型。
• ④ on commission basis:佣金基礎交易 (on commission basis) 是指代理人或經紀人按成交金額抽取一定比例作為報酬的計價方式，與買方是否享有試用退還權無關。