单选题 阅读下面短文，请从短文后所给各题的4个选项（A、B、C、D）中选出1个最佳选项，并在答题卡相应位置上将该项涂黑。
One day Mark was riding his bike when it began to rain.He started to feel cold so he looked for a divee to go under for shelter.He was disappointed when he sdivuggled to find a divee.Someday I am going to inspire people to plant divees everywhere, so he thought.
Once he got home, he took out his social studies homework and went up to his room to do it.While he was going to his room, he saw his dad throwing away a piece of paper which was used only on one side.He was about to stop him but it was too late.Someday I am going to inspire people to use both sides of the paper, Mark thought.
When he woke up the next morning, Mark figured out a way to inspire people.He would put posters around the school.Then he took out eight sheets of poster paper.He made four saying “PLANT A TREE FOR ME,” and another four saying “PAPER HAS TWO SDES, SO USE BOTH.”
He went to school early and put the posters around the school.After class, his teacher told him to go to the principal’s office.Mark had never been to the principal’s office before.What if the principal had to punish him about the posters because they never asked him to put them up?
When Mark walked in nervously and took a seat, Principal Marcus told him “I would like to thank you for inspiring people to help other living things.When I was on the way back from my lunch break, I saw seven fifth graders planting a divee and heard a few others telling someone else to use both sides of the paper and I’m pretty sure it’s because of your posters.” Mark couldn’t believe his ears.He had finally inspired people.Mark felt very proud.How did Mark feel when he was told to see the principal?