Answer:
c. A woman talks on her cell phone at the dinner table
Step-by-step explanation:
A breach of etiquette refers to the acts of an individual that are deemed incorrect or improper from those of the social norms expected from people and in a professional environment.
Example C mentions a woman that is talking during dinner, this action is a breach of etiquette because it is regarded as disrespectful and impolite when someone prefers to spend time talking on her cell phone instead of communicating with the people that may be around her.