Under what condition can premiums be lowered by $100 with specified perils or comprehensive coverage?

The option relating to theft prevention is correct because many insurance companies offer premium discounts when vehicles are equipped with certain theft prevention devices or systems. This is based on the principle that reducing the risk of theft directly impacts the insurer's financial exposure. When a vehicle owner takes proactive measures to protect their vehicle from theft—such as installing a GPS tracking device or a vehicle immobilizer—the insurance company may reward that low-risk behavior with a premium reduction. This incentivizes policyholders to invest in safety measures, thereby potentially lowering the frequency of theft claims and the overall risk for the insurer.

Other scenarios, such as selling the vehicle or the vehicle's age, do not universally guarantee a premium reduction tied to specified perils or comprehensive coverage. Completing a driving course may lead to discounts on liability coverage but is less directly related to theft prevention.