Which of the following would be the greatest concern for a company that is aware of the consequences of non-compliance with government regulations?

Sanctions are the greatest concern because they represent penalties or punitive actions imposed for non-compliance with regulations. These can include significant financial fines, legal action, reputational damage, and even loss of operating licenses, directly impacting a company's bottom line and ability to function. The "right to be forgotten" is a data privacy concept, not a direct consequence of non-compliance. External compliance reporting and attestation are processes or statements related to demonstrating compliance, not the negative consequences of failing to comply.