Identify the oxymoron
An oxymoron is a term used to indicate a phrase that contains conflicting ideas.
A copy is a duplicate of the original. Therefore, 'a original copy' is an oxymoron as the original cannot be a copy.
'Crowd' means a large gathering. Therefore, 'a small crowd' is an oxymoron.
A secret is something that is supposed to be known by others. Therefore, 'open secret' is an oxymoron as well.
All the given options are oxymorons. Therefore, option D is the right answer.
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