What is prohibited against Hong Kong residents in terms of personal freedom?

The correct answer highlights that detention or imprisonment of Hong Kong residents is prohibited in a manner that contravenes their personal freedoms as outlined in the Basic Law. The Basic Law sets the framework for the protection of various rights and freedoms, including those related to personal liberty. Arbitrary detention or imprisonment violates the principle of personal freedom, which is essential to the rule of law in Hong Kong. This principle upholds that individuals should not be deprived of their liberty without due legal process and on justifiable grounds.

In contrast, questioning, arrest, and surveillance can be lawful and necessary practices when carried out in accordance with the rule of law and established legal procedures. For instance, law enforcement may question individuals as part of an investigation when they have reasonable grounds to do so. Similarly, arrest is permissible under the law if there is probable cause, and surveillance might be conducted under specific legal justifications. Therefore, while these actions can involve certain restrictions on personal freedom, they do not inherently contradict the foundational principles protecting personal liberty in the same way that unlawful detention or imprisonment does.