Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
at any time prior to order acceptance , we reserve the right to decline or reject your order . 

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