Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Sydney loved to play with his toys that his mother had bought him. His favorite toy was his orange ball. He loved the orange ball so much that he played all day with it. One day he discovered if he tossed the ball at his toy cups they fell. He was very happy that he discovered such a fun game to play.
 selected sentence: His favorite toy was his orange ball.

His mother buys some toys for him >Causes/Enables> His favorite toy is his orange ball