When are you required to show proof of insurance to law enforcement?

Answer: B — If you are involved in an accident or stopped for a citation

Proof of insurance is required when you are involved in an accident or stopped for a citation because these situations directly relate to confirming that you have insurance to cover potential liabilities. Law enforcement needs to ensure that drivers have the necessary insurance to protect other parties in the event of an accident and to uphold legal requirements regarding vehicle operation. This is a critical aspect of road safety and the legal responsibilities associated with driving. In contrast, failing a field sobriety test primarily relates to driving under the influence laws rather than insurance verification. While driving with a passenger under 18 may impose additional responsibilities on the driver, it does not necessitate the immediate presentation of insurance. Lastly, having an expired registration is a separate legal issue that does not directly invoke the need to show proof of insurance at that moment. Hence, showing proof of insurance is most pertinent and required in situations involving accidents or traffic citations.