The answer to your question is form
Assonance is the correct ANSWER!
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I'd say that the statement from FDR's speeches that uses parallel structure is C. American ships have been sunk; American airplanes have been destroyed.
Both of these independent clauses use the passive form of the verb - in the first clause, the passive form of the verb <em>to sink </em>is used, and in the second, of the verb <em>to destroy.
</em>A parallel structure means that throughout a sentence, the same form of words is used, and given that here both sentences have passive forms, I'd say C is the correct answer.<em>
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You haven’t attached the sonnet, so I can only guess at what you are referring to. But I believe I had this same sonnet last year in my English class, if it is the one describing his love, then it is C.