What kind of argument is it when someone is questioned in a manner that assumes their guilt based solely on the question phrasing?

The term that best fits the situation described is a leading question. A leading question is crafted in such a way that it subtly suggests its own answer or assumes the truth of a premise that has not been established. When someone is questioned in this manner, it can create an implication of guilt or wrongdoing without the need for concrete evidence. This technique persuades the respondent to agree to an assumption embedded in the question itself, thereby influencing the direction of the discussion or inquiry.

In contrast, disproving a minor point involves addressing and refuting a specific claim that may not be central to the main argument but still requires clarification. Diversion refers to redirecting attention from the main issue to another subject, usually to avoid addressing a pertinent argument. Ad Hominem, on the other hand, is an attack on the character or motive of the person making an argument rather than addressing the argument itself. Each of these other options represents different argumentative strategies that do not hinge on the phrasing of a question meant to lead or imply conclusions.