Read the following context and choose the best option to answer the question.
Context: I assured her before leaving her home . It was no trouble to take the boat back across the river to Vos . It did n't take long at all plus the female shipmaster - who was obviously starved for a man and was making eyes at Julan - only charged us a single gold coin to take us to the Vos docks . When we reached Vos , a male Dunmer noticed Julan and exclaimed , " Aha , my best customer !
Question: Why is the narrator convinced that the boat can return to its dock ?
Options: 
- The narrator believes the River Vos is navigable .
 - The narrator believes the River Vos is drained of water .
 - None of the above choices .
 - The narrator believes the River Vos is dangerous .


The narrator believes the River Vos is navigable .