Answer:
of a unit
Step-by-step explanation:
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D. 4 hours. I would like brainlies please, so I can reach my new rank EXPERT. Thanks ~Angel411.

Answer Choice A. 
Answer Choice B. 
Answer Choice C. 
<u><em>Answer Choice D.
</em></u>
The correct answer is <u><em>D. 7√5/5</em></u>
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