What offense is committed by a public servant who intentionally subjects another to unlawful actions while acting under his official capacity?

The correct answer, official oppression, refers to the offense committed by a public servant who, while functioning in their official capacity, intentionally violates the rights of another person. This offense underscores the misuse of authority by a public official, where the individual in a position of power acts unlawfully, potentially causing harm or distress to an individual.

In cases of official oppression, the actions taken by the public servant exceed the boundaries of their duty and the law, demonstrating a willful misconduct that undermines public trust. This is distinct from other choices such as malpractice, which typically refers to negligence or failure to meet a standard of care in a professional setting, and unlawful detention, which specifically relates to the wrongful restraint of someone's liberty without legal justification. Abuse of power is a broader concept that might encompass various wrongful acts, but it doesn’t specifically capture the legal ramifications of the misconduct as sharply as official oppression does.

The focus of official oppression is on the intentional action taken by the public servant that is both unlawful and done while in an official role, making it the most precise fit for the described scenario.