You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: PEOPLE IN HISTORY 
Clue: The spear that killed him in 1779 sold at auction in 2003 for over $400,000
captain james cook

Category: WORLD RIVERS 
Clue: With 4, more national capitals are located on this river than any other river in the world
the danube

Category: WALL STREET 
Clue: As part of 1997 changes to its industrial average group, Dow Jones replaced Woolworth with this retailer

wal-mart