TASK DEFINITION: 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.
PROBLEM: Category: AFRICAN COUNTRIES 
Clue: The northernmost country in Africa, it's much smaller than the countries that border it

SOLUTION: tunisia

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

SOLUTION: the danube

PROBLEM: Category: 20th CENTURY ATHLETES 
Clue: In 1938, at age 25, she became the youngest person made a Knight First Class of the Order of St. Olav

SOLUTION:
sonja henie