@Jorge 's answer is absolutely correct.  
  
If we're talking specifically about [this][1] I would examine the comments again. Particularly the ones by @psusi and @Dylan .  Sudo is absolutely possible on live media...so your answer was factually incorrect.  If you went back through and fixed that bit, I suspect you would be at at least 0 (which would be a net gain of 16 points)  
  
[1]: http://askubuntu.com/questions/152727/cannot-use-sudo-from-live-cd/152729#152729