Explanation:

- Option 1: Extremist Act

These acts often involve violence or harm towards others. Victims can be individuals or communities.

- Option 2: Prostitution

Often considered a victimless crime because it's a consensual act between adults. However, it can involve exploitation.

- Option 3: Murder

Clearly involves victims as it results in the loss of life.

- Option 4: Rape

Involves serious harm and the violation of another person, making it far from victimless.

Option 2: Prostitution is often viewed as a victimless crime, assuming consent and no exploitation.