Choose the Word or Phrase in [ ] Which Will

Choose the word or phrase in [ ] which will correctly complete the statement. Select
-You are buying a large amount of merchandise through the mail from a dealer several hundred miles from you with whom you have never dealt before.The dealer will probably require that you pay him with a cashiers or [travelers | certified] check.

A) for the first item
B) for the second item
C) if neither item will correctly complete the statement.