Read the passage, then answer the question.
The Missing Button
Grandpa kept a tin of old buttons on his desk. When Eli needed one for his coat, he chose a round brown button that almost matched. Later, his sister found a square button that matched the coat better, but it had only two holes instead of four. Grandpa showed Eli how the number of holes affects how tightly a button can be sewn.
Why does Eli first choose the round brown button?
