story: Everyday Rob had to walk to school. But he decided that riding a bike to school would be better. He saved up money for a new bike. And he was able to bike to school quickly. And his new bike gave him freedom to go where to he wanted.
 selected sentence: But he decided that riding a bike to school would be better.
Rob decides riding a bike to school is better >Causes/Enables> Rob saves money to buy a bike