下列汇票记载中，属于有效汇票的是（ ） 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.3 account 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.