7. 當 T-bond 期貨價格為 103.4375 時，下列哪一個 T-bond 為最便宜可交割債券(the cheapest to deliver bond)？ (A)債券報價(Quoted bond price)= 110.25; 轉換因子(conversion factor) = 1.0395 (B)Quoted bond price = 160.125; conversion factor = 1.5180 (C)Quoted bond price = 131.00; conversion factor = 1.2650 (D)Quoted bond price = 143.375; conversion factor = 1.3470