'In 399 BC, a jury in Athens condemned Socrates to death for impiety and corrupting the morals of the youth. Socrates' friends offered to help him escape, but Socrates refused. Socrates argued that the fact that he had lived in Athens for so many years meant that he had committed himself to obeying its laws. It would therefore be wrong for him to break those very laws he was implicitly committed to obeying.' Which one of the following claims constitutes the most plausible challenge to Socrates' argument?