Question: James used an axe and a saw to chop wood, shape it, and make a shelter.  He kept adding wood to it, building it bigger and bigger, until it became a what?

Choices: 
- shelterbelt
- tree
- house
- home
- bus stop

The rationale to choose "house" as the answer is that: 

james used an axe and a saw to chop wood, shape it, and make a shelter. he kept adding wood to it, building it bigger and bigger, until it became a house