Respuesta :
Dred Scott case was based on the slavery of the African Americans in the State. The argument put forward by Scott enabled him to be free, as he lived in a free state.
Who was Dred Scott?
Dred Scott was the African American Slave. He was bought to the slave-free region in the U.S. and was regarded as free. Later he was bought back to the slavery region, and he demanded freedom as he was once freed.
Thus, the argument put forward by Dred Scott in the Scott v. Sandford case was that he must be let free as he lives in the free state. Thus, option A is correct.
Learn more about Dred Scott, here:
https://brainly.com/question/23987166