How much alcohol in a minor's system constitutes driving or operating a watercraft under the influence according to TABC?

The correct option reflects that in Texas law, specifically under the Texas Alcoholic Beverage Commission (TABC) regulations, minors are subject to a zero-tolerance policy regarding alcohol consumption. This means that any detectable amount of alcohol in a minor’s system while driving or operating a watercraft is considered illegal and constitutes driving or operating under the influence. This strict regulation underscores the state's commitment to preventing alcohol-related accidents and protecting young individuals.

Although other options mention specific blood alcohol concentration levels, they do not apply to minors, who are prohibited from consuming alcohol completely. Therefore, any presence of alcohol, no matter how minute, is sufficient for legal action.