单选题 根据下列汇票记载，可判定记载为______的汇票为有效汇票。
   A．Pay to Tomson Co. or order the sum of two thousand US dollars
   B．Pay to Tomson Co. providing the goods they supply are complied with contract the sum of five hundred Hongkong dollars
   C．Pay to Tomson Co. out of the proceeds in our No. 3account the sum of three thousand US dollars
   D．Pay to Tomson Co. the sum of four thousand US dollars upon receipt of Bill of Lading No. 1235