Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
in the event of an error , we reserve the right to correct such error and revise your order accordingly ( which includes charging the correct price ) or to cancel the order and refund any amount charged . 

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