Answer:
The author's purpose for writing this is:
C. Entertain.
Explanation:
Notice how this passage looks like the beginning of a short story. It introduces a couple of characters and some setting as well. We know there are two boys who enjoy competing against each other. We also know the story most likely takes place during winter. Therefore, this is the kind of text designed to entertain. The language is light and a bit descriptive. There is no attempt to inform about a real-life event or persuade readers to do something.