The map is one of the best tools a man has _    _ he goes to a new place.[    ]

A. whenever  

B. whatever                

C. wherever        

D. however

如果持票人转让出票人记载了“不得转让”字样的汇票，则该转让不发生票据法上的效力，而只具有普通债权让与的效力。 ( )