The correct answer is (a). Ignorance of law is no excuse.
The maxim “Ignorantia juris non excusat” is a Latin phrase that means “ignorance of the law excuses not.” In other words, it is not a valid defense to say that you did not know the law when you broke it. This is because the law is presumed to be known to everyone, and it is your responsibility to be aware of the laws that apply to you.
There are a few exceptions to this rule. For example, if you are mentally incompetent, you may not be held responsible for breaking the law if you did not know what you were doing. Additionally, if you are a child, you may be given a lesser punishment for breaking the law if you did not know what you were doing.
However, in general, ignorance of the law is not a valid defense. If you are accused of breaking the law, it is important to consult with an attorney to discuss your options.