What might be a consequence of failing to secure a vehicle during a rescue operation?

Securing a vehicle during a rescue operation is crucial for ensuring the safety of both the victims and the rescuers. If the vehicle is not secured, it could potentially roll over or move unexpectedly due to factors like its positioning on an incline, shifting weight, or the actions of rescuers working around it. This movement can lead to serious injury for those inside the vehicle, as well as for rescuers attempting to perform their duties. By securing the vehicle, you create a stable and controlled environment that minimizes the risk of sudden movements, thereby enhancing the overall safety of the rescue operation.

The other outcomes presented, such as making the vehicle more difficult to open or increasing the distress of passengers, are secondary concerns. While they may be relevant to the rescue scenario, the immediate and most dangerous risk is the physical hazard posed by an unsecured vehicle rolling or shifting during the operation.