Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
minors may only participate in an experience , event or other host service if accompanied by an adult who is responsible for them . 

```
. OPTIONS: ['None' 'Arbitration' 'Jurisdiction' 'Content removal' 'Unilateral change'
 'Contract by using' 'Choice of law' 'Unilateral termination'
 'Limitation of liability'].