What type of evidence includes a witness statement that tends to prove or disprove facts about a case?

Testimonial evidence is the correct choice in this context because it encompasses statements made by witnesses who provide their observations or experiences related to a case. This type of evidence is critical in legal proceedings as it can directly influence how facts are interpreted. Witness statements can either support or challenge the established narrative of events, thereby helping to establish guilt or innocence.

Physical evidence typically refers to tangible objects found at a crime scene, such as fingerprints, weapons, or DNA, while documentary evidence consists of written or recorded materials that can provide context or corroborate facts. Circumstantial evidence implies indirect proof—it points to the likelihood of a conclusion being true but does not directly establish it. Testimonial evidence stands out as it is based on human experience and perception, making it crucial for ascertaining factual circumstances in criminal investigations.