Read the following context and choose the best option to answer the question.
Context: It was great having so many visitors to wait with , and talk about the trail . Before heading to High Point , Billy and I took a detour to go see Hidden Shelter . It was an amazingly gorgeous site , just off of the trail , that Jim Murray built 15 years ago . He had a free hut for hikers , with a shower , bathroom , sink , loft and water .
Question: Why did Jim Murray build a free hut for hikers ?
Options: 
- He wants the hikers in the area to be cleaner .
 - He wanted to do something nice for other people .
 - It 's a hidden shelter .
 - The site it 's built on is gorgeous .


He wanted to do something nice for other people .