What is the stated state of the mine door in the intro?

What is the stated state of the mine door in the intro?

• A. The door is always unlocked to the hallway
• B. The door is always locked to the hallway
• C. The door unlocks itself when approached
• D. The door requires a password

Answer: (C)

The key idea here is understanding how the door behaves as described in the intro. It states that the mine door unlocks itself when someone approaches, indicating a proximity-trigger mechanism that grants access automatically rather than staying in a fixed state. That proximity-based action explains why this option fits best: approaching the door causes the unlock, so you don’t need to manually unlock it or remember a password. The other possibilities imply constant states or additional requirements not described—being always unlocked, always locked, or needing a password.

The key idea here is understanding how the door behaves as described in the intro. It states that the mine door unlocks itself when someone approaches, indicating a proximity-trigger mechanism that grants access automatically rather than staying in a fixed state. That proximity-based action explains why this option fits best: approaching the door causes the unlock, so you don’t need to manually unlock it or remember a password. The other possibilities imply constant states or additional requirements not described—being always unlocked, always locked, or needing a password.