challenge: How are points awarded in the 1990-91 Biathlon World Cup for men?
  
  A. First place gives 25 points, 2nd place 22 pts, 3rd place 20 pts, 4th place 18 pts, then linearly decreasing by two points down to 30th place
  B. First place gives 32 points, 2nd place 28 pts, 3rd place 26 pts, 4th place 24 pts, then linearly decreasing by two points down to 25th place
  C. First place gives 30 points, 2nd place 26 pts, 3rd place 24 pts, 4th place 22 pts, then linearly decreasing by one point down to 25th place
  D. First place gives 28 points, 2nd place 24 pts, 3rd place 22 pts, 4th place 20 pts, then linearly decreasing by one point down to 30th place
  Answer: 