Final answer:
The legal BAC limit for New Jersey drivers under the age of twenty-one is 0.01%.
Step-by-step explanation:
The legal blood alcohol concentration (BAC) limit for New Jersey drivers who are under the age of twenty-one is 0.01%. In New Jersey, as in many states across the US, there is a zero tolerance policy for underage drinking and driving. This means that any detectable amount of alcohol in the blood can result in penalties for young drivers. It is important for young drivers to understand and adhere to these laws to ensure their safety and the safety of others on the road.