SAT Question f2c48e47: Text Structure And Purpose answer and explanation

English - Text Structure And Purpose - Overall Text Structure
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The following text is from Charlotte Perkins Gilman’s 1910 poem “The Earth’s Entail.” No matter how we cultivate the land, Taming the forest and the prairie free; No matter how we irrigate the sand, Making the desert blossom at command, We must always leave the borders of the sea; The immeasureable reaches Of the windy wave-wet beaches, The million-mile-long margin of the sea.
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Difficulty:Medium
Which choice best describes the overall structure of the text?