What is one of the destruction indicators?

The correct choice highlights a clear and evident sign of destruction. When a vehicle explodes, it indicates a significant level of damage or incapacitation. This destruction indicator serves as a definitive endpoint for the vehicle's operational status, signaling that it can no longer perform its intended functions in a military or tactical context. In contrast, other options describe scenarios that either suggest ongoing functionality (like being operational or increasing speed) or scenarios that imply reinforcement, which could suggest enhancements in capability rather than destruction. Therefore, an explosion is a concrete manifestation of complete destruction, making it a strong indicator in assessments of vehicle status in strategic evaluations.