Correct Answer: B
                            
                            Explanation:
                            (B) The job of a pilot is to navigate (a ship or plane); the job of an oarsman is to propel (that is, to power) a boat.
NAVIGATE: to make one‘s way; walk
Ignite: to heat to a great degree; make glow with 
            heat
 
Oarsman: one who rows, esp. one who rows a 
                 racing shell
propel: to push, drive, or impel onward, forward, 
             or ahead
Midshipman: a junior British naval officer ranking 
                       between naval cadet and 
                       sub lieutenant
Helmsman: the person at the helm; one who 
                    steers a ship or boat
dock: a platform at which trucks or freight cars are 
          loaded and unloaded