Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
9.5 in certain circumstances , airbnb may decide , in its sole discretion , that it is necessary to cancel a confirmed booking and make appropriate refund and payout decisions . 

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