Final answer:
The definition of insolent that fits best is 'B) Rude,' which refers to a disrespectful or arrogant attitude.
Step-by-step explanation:
The word insolent is typically used to describe someone who is showing a rude or arrogant lack of respect. Therefore, in the context provided, the definition that most clearly fits the word insolent would be B) Rude. It is the opposite of being polite, and it implies a disdainful or contemptuous attitude towards others. For example, if a student talks back to a teacher in a disrespectful way, that behavior could be described as insolent.