Which question word best completes the paragraph below?The N...

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Q572927 Inglês
Which question word best completes the paragraph below?
The National Gallery in London is among a growing number of venues that have banned selfie sticks. ________ is so wrong with walking around a gallery taking pictures of yourself ? The gallery says it needs to protect artworks and other visitors. But some users can’t see what the fuss is about.
(Adapted from http://www.bbc.com).
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