To violate a legal duty by an act or a failure to act is called

A) damage.
B) harm.
C) breach.
D) incompetence.

Breach

The breaking or failing to fulfill a legal obligation, contract, or duty.

Legal Duty

An obligation established by law requiring an individual or entity to conform to a standard of reasonable care to prevent harm to others.

Incompetence

A lack of ability, legal qualifications, or fitness to discharge required duties or tasks.