Which of the following is an example of direct evidence?

Direct evidence offers firsthand accounts or tangible proof that can directly establish a fact in question. In the context of this question, a witness hearing an explosion serves as direct evidence because it is an immediate observation made by an individual that can attest to the event occurring. This type of evidence provides direct support to the claims or facts being investigated, thereby helping to establish a clearer understanding of the situation.

Other types of evidence, while valuable, serve different roles. For instance, a piece of burnt wood could indicate that a fire occurred but does not directly confirm the event. A security camera recording may provide visual proof of an incident, but it requires interpretation and may not be an immediate observation like a witness statement. Investigative reports compile various findings and witness accounts but are more of a secondary source rather than a direct observation.