The correct answer is: c. the particulars of the scene depicted on the urn.
In the first stanza the speaker winders about the pictures in the urn and calls them "historian". The speaker begins to question what legends are the figures telling and where the legend comes from. While looking at the picture he begins to ask more questions about the figures such as "What men or gods are these? What maidens loth? What mad pursuit? What struggle to escape? What pipes and timbrels? What wild ecstasy?". Therefore, the correct answer is option c.
