Which type of witness is someone who testifies about what they saw at the scene of a crime?

The correct choice is the eyewitness, as this type of witness provides testimony based on their direct observation of events at the scene of a crime. Eyewitnesses are often crucial in legal proceedings because their accounts can provide valuable evidence about what occurred during the incident, including identifying the perpetrator or detailing the sequence of events. Their testimony is typically based on personal experience and perception, which makes it distinct and important in court cases.

Character witnesses, on the other hand, offer opinions about the character or reputation of a person involved in the case, which may not relate directly to the events of the crime itself. Expert witnesses are individuals with specialized knowledge or expertise relevant to the case, who provide opinions based on their professional knowledge rather than firsthand experiences. Subpoena witnesses are simply individuals who are legally ordered to appear in court but may not necessarily have direct knowledge of the events in question. Thus, the definition and role of an eyewitness in testimony align perfectly with the question asked.