I feel like there is some overthinking of the monty problem here. The answer no makes the most sense. Consider this, what is behind the doors is predetermined, right? So either the smallest number of people you can hit is 0 or 5. The most is 10. Chosing either a or c guarentees at least 5 people hit. Choosing B limits the number who can be hit to 5 (if they’re behind the door). So you should always choose B and always keep the choice.

The currebt rule says “No propritary tools” which seems reasonable when you add in that glueing in is considered “non-replacable” too. The GBA SP needed a single screw to hold in it’s battery and nothing else. Plus with proper threading, screws last much longer than plastic clips.