Answer:
A) true
Step-by-step explanation:
This requirement applies mostly to used cars. Some states do not require emissions inspections for vehicles that are less than 4 or 6 years old (depends on the state, e.g. Arizona's threshold is 6 years). Other states also allow certain old vehicles to not pass emissions inspections (e.g. Massachusetts does not requires vehicles over 15 years old to pass emissions inspections).
Those vehicles that do not pass the emissions inspections will not be registered by the Department of Motor Vehicles (DMV), that means they will not receive a license plate so it is illegal to drive them.