Final answer:
It is generally illegal to have an open container of alcohol in the passenger area of a vehicle. The correct action is to store open containers in the trunk where they are not accessible to occupants.
Step-by-step explanation:
The law regarding open containers of alcohol in vehicles is quite clear. It is generally illegal across the United States to have an open container of alcohol in the passenger area of a vehicle. This applies to all occupants of the vehicle, including the driver. The specifics can vary by state, but the rule of thumb is that an open container must be stored in a location that is not accessible to any of the vehicle's occupants while in transit, such as the trunk. Option 'b' is the most accurate, where it's legal if the open container is in the trunk. Option 'd' is misleading as a sealed container may be placed in the glove compartment, but once it's opened, it becomes an open container.