The answer is c
I had the same question got it right

The Whitman's poem has a very similar title
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You did not provide the possible answers, however, one of the major differences was that the first civilizations in the classical era had a much more elaborate and a developed political system that was often democratic and had parliaments, senates, voters, and similar, while first civilizations, often called river valley civilizations, often had absolutist monarchs.
I would choose the last choice, D. Adverbial.
Adverbial phrases include two or more words that serve as adverbs. So "in an hour or two" can be classified as an adverb phrase.
Answer: The poet is saying that people don't live long; life is brief.
Explanation:
<em>''Ode on a Grecian Urn"</em> was written by the English Romantic poet, John Keats. It is one of the several ''Great Odes of 1819" which was first published anonymously.
In this poem, Keats compares the duration of a vessel with that of our life. The vessel is resistant and will last for a long period of time, while our life is brief and fragile, and leads to the old age. The Grecian urn, passed down from generation to generation, does not age and does not die. With this unusual comparison, the poet portrays our limited existence on earth. This theme is reflected in the phrase <em>"old age shall this generation waste.''</em>