What must a shareholder show to obtain an oppression remedy?

To obtain an oppression remedy, a shareholder must demonstrate that a corporate act is unfairly prejudicial to one or more shareholders. This means that the actions or decisions made by the company or its directors negatively affect the shareholder's interests in a manner that is unjust or oppressive. The oppression remedy is designed to protect shareholders from conduct that goes against their reasonable expectations and does not align with fair treatment.

The focus of the remedy is on the impact of corporate actions and the fairness of those actions, rather than solely on the existence of any fiduciary duty or the manner of management of the company. Therefore, the core of the remedy lies in proving that the shareholder's rights or interests are being unfairly compromised, allowing the court to provide equitable relief based on the circumstances presented.

Other options, while relevant to corporate governance and shareholder rights, do not directly address the specific requirement to establish grounds for an oppression remedy. It is crucial for shareholders seeking this type of legal relief to provide clear evidence of how the corporate actions have led to an unfair disadvantage or harm, which is exactly what is encapsulated in the correct answer.