(1) Museums resort to such tactics to generate revenues. This is stated in the argument, hence not an assumption.
(2) The Administration does not have any mechanism to stop museums from displaying such fake paintings. Could be assumption, but too far fetched in my opinion.
(3) The people visiting these museums can find whether a museum displays fake paintings or not. Correct. The Investigating officer asks people to stop visiting such museums, so he/she believes that people can find out whether
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(2) The Administration does not have any mechanism to stop museums from displaying such fake paintings. Could be assumption, but too far fetched in my opinion.
(3) The people visiting these museums can find whether a museum displays fake paintings or not. Correct. The Investigating officer asks people to stop visiting such museums, so he/she believes that people can find out whether
...
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