Answer:
I think it's b because it shows what's happening
omg i love that song and NF is one of my favourites!
<em>Answer:</em>
<u><em>D</em></u>
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<u><em>Explanation:</em></u>
<u><em>Hertz is the SI unit used for frequency, and it is defined as one wavelenght per second in physics. Considering that waves repeat themselves in cycles, D is a reasonable answer</em></u>
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