Final answer:
For individuals under 21, having an alcohol concentration of 0.02 indicates they are not legally allowed to drive due to the National Minimum Drinking Age Act and zero-tolerance laws for underage drinking and driving.
Step-by-step explanation:
If you are under the age of 21 and a chemical test shows an alcohol concentration of 0.02, it implies that you are not legally allowed to drive. This is because the National Minimum Drinking Age Act of 1984 requires individuals to be at least twenty-one years of age to consume alcohol legally. Since underage drinking is against the law, any detectable amount of alcohol in the system of a person under 21 is often grounds for a DUI (Driving Under the Influence) charge or related offense, depending on the state. States have zero-tolerance laws for underage drinking and driving, and many set the BAC limit at 0.02% or even lower for individuals under 21, which is significantly lower than the 0.08% limit for those of legal drinking age.
The consequences of underage drinking and driving could involve several penalties, such as license suspension, fines, or mandatory participation in an alcohol education program. Therefore, the correct answer is 2) You are not legally allowed to drive.