Here are the correct matches between the quotes and their paraphrases:
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Quote: "The subject to be regulated is commerce, and . . . it becomes necessary to settle the meaning of the word. The counsel for the appellee would limit it to traffic, to buying and selling, or the interchange of commodities, and do not admit that it comprehends navigation. . . ."
Paraphrase: D. We need to define the word 'commerce.' It only means buying and selling things, and not moving them from place to place. -
Quote: "All America understands, and has uniformly understood, the word 'commerce' to comprehend navigation. It was so understood, and must have been so understood, when the Constitution was framed. . . ."
Paraphrase: B. The whole country knows that 'commerce' includes moving things from place to place. The Constitution's writers understood this, too. -
Quote: "The word ‘among’ means intermingled with. A thing which is among others is intermingled with them. Commerce among the States cannot stop at the external boundary line of each State, but may be introduced into the interior.”
Paraphrase: A. Commerce 'among' the states means that multiple states are involved. It isn't possible to have trade between the states without crossing the boundaries of those states.
Unused option: C. Different people are going to have different definitions of words, so we should agree to disagree on those definitions.