' C ' has the misplaced modifier. It makes the sentence sound like the commands take the obedience class.
It should say "The dogs that take the obedience class know several commands.".
B) Hard work Shapes a person's character
Our world is not a utopia because a perfect world doesn’t exist and there will always be conflict. Since they are both just general ideas or theories of reality, we are not a dystopia either. Many believe that we are slowly going in the direction of dystopia but conflict is more of a cycle that happens and it won’t all happen at once that will lead to certain doom like in a dystopia.