阅读下列短文，从每题所给的四个选项（A、B、C和D)中，选出最佳选项。

　　Back in September of 2005 on the first day of school Martha Cochran a social studies school teacher at Robinson High School did something unforgettable．On the first day of school with permission of the school headmaster she took all of the desks out of the classroom．

　　The kids came into the first period．They walked in there were no desks．They looked around and said "Ms Cochran where's our desks? " And she said "You can't have a desk until you tell me how you earn them．”

　　They thought "Well maybe it's our grades．”

　　"No " she said．

　　"Maybe it's our behavior．"

　　And she told them "No it's not even your behavior．"

　　Second period the same thing．Third period…By early afternoon television news reporters had gathered in Ms．Cochran's class to find out about this crazy teacher．

　　The last period of the day Martha Cochran gathered her class．They were at this time sitting on the ground floor around the sides of the room．"Throughout the day no one has really understood how you earn the ordinary desks in this classroom．" she said "Now I'm going to tell you．"

　　Martha Cochran went to the door of the classroom and opened it and as she did twenty－seven adults who were fathers or mothers of the kids walked into that classroom each one having a school desk．And they placed those school desks in rows．And by the time they had finished placing those desks; those kids for the first time in their lives understood how they earned those desks．

　　Martha said "You don't have to earn those desks．They did it for you．They put them out there for you but it's up to you to sit here responsibly to learn to be good students and good citizens because they paid a price for you to have that desk and don't ever forget it! "