Read the following context and choose the best option to answer the question.
Context: The little boy visited me a lot . After the mother died of a heart attack and the little boy went to live with older siblings , a young woman named Amy lived in that apartment . On the first floor lived an older African - American couple . For security there was a deadbolt on the front door to the building .
Question: What may be the reason for the dead bolt ?
Options: 
- There have been multiple murders in the area .
 - They live in an unsafe neighborhood .
 - Their residents are paranoid .
 - They live in a safe neighborhood .


They live in an unsafe neighborhood .