Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
( c ) your user material does not advertise any product or service or solicit any business . 

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