Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the goods must be fully returned in the original packaging with the applicable proof of purchase , and you will be responsible for the cost of returning the goods to us . 

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