Suppose Carla is a bus driver and she was driving the bus when she suffered a heart attack. As a result, the bus hits another vehicle and five children are injured. Carla had no warning signs of heart failure and has had perfect health up until the accident. Carla's attorneys should argue she is not liable under which legal doctrine?

Unfortunate Accident

Explanation:

Since the accident was not due to any lack in the driving skills, but as Carla could not function properly, because of Heart Attack, this is not an accident for which Carla could be held liable.

Although Carla was driving, but she could be held liable, as that is because of unfortunate circumstances, not in the hands of Carla, and could not be avoided by the actions of Carla.

Thus, it is termed as Unfortunate Accident.