Answer:
The correct answer is A. The duty of care
Explanation:
The duty of care is refereed to as a legal responsibility which is forced on an individual or person requiring commitment to a standard of reasonable care while executing any acts that could foreseeably do harm to others.
It can also be regarded as a social contract formalization, the inferred responsibilities done by individuals towards others within society or public.
In this example Ernest is mostly likely liable for breach of the duty of care.