phrontistery is the term for that description.
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I think the correct answer from the choices listed above is option B. The theme that is emphasized in the excerpt from "Ode on a Grecian Urn" by John Keats is that the <span>unfulfilled desires and dreams seem sweeter. It is can be seen from the lines:
</span>Heard melodies are sweet, but those unheard
Are sweeter; therefore, ye soft pipes, play on;
<span>Not to the sensual ear, but, more endear'd,</span>
What text/ book? Need more details