Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if you have any questions about this agreement , please contact us by email : service@nintendo.de . 

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