B. It has proper grammar...
<span>B. The phrase is a nonessential adjective clause.
The answer is B because while the sentence contains information, it has nothing to do with the sentence about gravity and motion.
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The answer is 8 1/9 because 73 goes into 9 8 times and the the reminder is 1 so therefore it is 8 1/9
I would go with D for the first one and B for the second one.