It is safe when you have metal detector because it can also sensor thieves or shoplifter who wish to bring clothes outside the store. Metal detectors are useful to find hidden metal objects and can detect not just nearby but even metal objects buried underground.
"but the great man is he who in the midst of the crowd keeps with perfect sweetness the independence of solitude."
This is the line that conveys what you are asking. In other words, it talks about keeping your individuality even in a "crowd," or with others. But if you analyze it, he still does not encourage withdrawing from the crowd but being "in the midst" of society while maintaining your independence/ individuality.
The old granny helps arrange Ira’s wedding
I think its B because the question says ''in what kind of house'' so that counts as lifestyle I hope it works.