The most direct decision of the Dred Scott decision was that the Supreme Court overturned Dred Scott decision of having a right to become an American citizen.
Dred Scott v. Sandford entails a fight for Slave right to become a citizen of United State.
Hence, the most direct decision of the Dred Scott decision was that the Supreme Court overturned Dred Scott decision of having a right to become an American citizen.
Therefore, the Option C is correct.
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