Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you may have access to a free trial period of the subscription program in accordance with certain promotional offers . 

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