Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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some reasons for rejection can include : ( a ) we are unable to supply you with the service , for example because that item is no longer available or because of an error in the price at the point of sale ; ( b ) you do not live in a country or region from which the services may be purchased ; or ( c ) you order more than the permitted maximum number of services . 

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