I'd use (a) or (b), but (c) is acceptable.
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ReegisWhere may I place the phrase 'very easily' in this sentence?Children can [here] get lost [here] in large shopping centres [here].
CalifJim(Not as in your first sentence, though, pace fjj.)I read the first sentence in a way that made it seem natural to me. I still think it's possible, but, in normal contexts, unlikely.