Passage Summary: Making passwords complicated was supposed to help, but it actually makes accounts less secure because people write the passwords down when they can't remember them.

Conclusion: Strict password rules actually increase the chance of unauthorized access to user accounts.

Reasoning: While guessing is usually impossible due to account lockouts, complex passwords are so hard to remember that users frequently write them down.

Analysis: The argument identifies a specific behavior—writing down passwords—and concludes this makes accounts less secure. However, there is a missing link between 'writing a password down' and 'someone else successfully using it to gain access.' To guarantee the conclusion, we need an assumption that establishes writing down passwords as a significant security vulnerability. Look for an answer that connects the physical act of recording a password to a higher probability of unauthorized entry.