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It's A

But once users spend a lot of time in an area wearing the device, they have a better ability to navigate that area even with the device removed. I imagine it's similar to how you would be able to navigate your home in low light

It's probably B. I have a fairly intuitive sense for north even without ever using this, although it does get confused sometimes. I've learned not to trust it coming out of the subway into tall buildings with narrow streets because more often than not I'll start heading a completely different direction than the way I wanted to go. I can see how this would help develop that sense, and I wonder if I'd have more success if I tried it

Maybe not forever, without ever putting it on, but you got it right in general.