Read the following context and choose the best option to answer the question.
Context: When , I was young I used to be scared of the stairs because I thought it was creepy . Now , it 's the perfect place to get a little naughty , and completely out of sight . Click here to see video clips from my naughty little hiding spot . Right on the stairs , I stripped out of my clothes , leaving on only my boots .
Question: what may be the reason for stairs being creepy ?
Options: 
- None of the above choices .
 - They are taped off .
 - They 've fallen down the stairs before .
 - They are dark .


They are dark .