Final answer:
In Edgar Allan Poe's The Philosophy of Composition, Poe says that the element of the poem The Raven that he decided first was the length.
Step-by-step explanation:
In Edgar Allan Poe's The Philosophy of Composition, Poe says that the element of the poem The Raven that he decided first was the length. He discusses the importance of the length of the line in a poem and how it can define a poet's style. The decision of how long to make lines is driven by factors like prosody, the musical component of language that projects the speaker's voice and breath.