The appropriate symbol within a play whose theme is the loss of youth is an unfinished painting on an easel. That is option D.
A theme is defined as the main idea a writer wants to expatiate in the drama.
A play that is bearing the loss of a youth as it's theme should have the symbol of an unfinished painting on an easel because death in a youthful age signifies an untimely death of an unfulfilled life.
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