I would say the correct answer is B. hyperbole.
Hyperbole is a figure of speech that authors use when they want to exaggerate things. So this 'vegetable love' cannot possibly grow larger than empires - the poem just wants to demonstrate the power and intensity of this love by using the figure of hyperbole. A paradox would include two completely opposite things, and <em>vast </em>and <em>slow </em>are not opposites.
A) short story
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I opted for choice "C", I believe it is the answer.
