Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if , on return to us , it is determined that the goods have been used or damaged , are missing components or are not in a resalable condition , we may charge a 15 % restocking fee or otherwise reduce the amount of your refund to take into account the damage , use or missing components . 

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