Explain simply why house is the correct answer to: 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?
Options:
- shelterbelt
- tree
- house
- home
- bus stop. Explanation:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
House provides shelter. House is made by adding wood, and building it bigger and bigger.