Question

which is one of the most common activities performed during a criminal investigation?
searching for witnesses and victims
ensuring victim satisfaction
patrolling in the community
scientific testing of evidence

Explanation:

Criminal investigations focus on gathering information to solve crimes. Searching for witnesses and victims is a foundational, early step to collect firsthand accounts and details about the incident. Ensuring victim satisfaction is a post-investigation or support task, not a core investigative activity. Community patrol is a preventive police duty, not specific to active investigations. Scientific testing of evidence is a later, specialized step, not as universally common as identifying and interviewing witnesses/victims early on.

Answer:

searching for witnesses and victims