Final answer:
The correct option is B. System failure. If an alarm does not go off and no exception exists, it indicates a system failure. It is important to identify and address the cause of the system failure to ensure that the alarm can operate effectively in emergency situations.
Step-by-step explanation:
If an alarm does not go off and no exception exists, it indicates a system failure. This means that there is a problem with the alarm system, which is preventing it from functioning properly. It is important to identify and address the cause of the system failure to ensure that the alarm can operate effectively in emergency situations.
For example, if a fire alarm doesn't go off when there is a fire, it poses a significant risk to people's safety and property. In this case, the system failure of the alarm could lead to dire consequences. This scenario is typically applicable to security systems, fire alarm systems, or other types of automated alert systems that are designed to notify individuals in case of an emergency.