<span>C. Disruption in the chain of begin cause bizarre natural occurrences with regard to animal and the weather.</span>
It depends on how you interpret it. While reading it, I interpret it as he means to say that love is as innocent as a person can make it. When he states she walks in beauty, he is most likely referring to the idea that she is beautiful and has a innocent lifestyle. My apologies if this is not the answer you are looking for.
It is a nonrestrictive relative clause because it begins with a relative pronoun, has both a subject and a verb, and is not necessary to the meaning of the sentence.
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- Yukari