B. the deeper message of a literary work
The Desiderata is that poem: "<span>Go placidly amid the noise and haste, and remember what peace there may be in silence".
The plot is basically self-help. Get up and get on with it.
I am not sure about the setting. I can make a guess: the setting would be the human mind.
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I would go with B, because it helps the reader understand what disseminate doesn't mean, which is to keep something a secret.
