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The correct answer is 1. an extended comparison.
A metaphor is a type of comparison - when you are symbolically comparing two or more things (without using words such as like or as), you are using a metaphor. If you extend that metaphor into several lines or stanzas within a poem, then you are using an extended metaphor, which commonly appears in epic poems such as The Odyssey or The Iliad.
Answer: The couplet allows for parallel form connecting the elements of thought.
Here are the connections:
God directs - from his head
guard him from on high- let ev'ry evil fly