Final answer:
Under California law, a blood alcohol content (BAC) of 0.01% can lead to the revocation of a driver's license for individuals under the age of 21.
Step-by-step explanation:
Under California law, the blood alcohol content (BAC) percentage that can lead to the revocation of a driver's license for individuals under the age of 21 is 0.01% (option a).
California has a zero tolerance policy for underage drinking and driving, meaning any trace of alcohol in a driver's system can result in penalties. Even a BAC below the legal limit for adults (0.08%) can lead to license suspension for individuals under 21.