I already know the answer of a) part which is Alice. Can anybody help me in finding answer of b) part.

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    What information are we to assumer 'the observer' has? Do they know the A/B/C tagged addresses are controlled by A/B/C? Do they know for certain which addresses are change addresses? In general, 'certainty' of blockchain analysis is a somewhat hopeless goal in the real world. – chytrik Oct 12 '18 at 23:08
  • Just out of curiosity, where does this question come from ? It's, strangely, identical to one of the HWs in one of my classes. – Shawn Dec 2 '18 at 22:37

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