Prisoners and slaves formed a: A. City mob
B. Group of workers
C. Group of tax collectors

B?

Explanation:

"Slaves worked everywhere – in private households, in mines and factories, and on farms."

I really don't know about the prisoners.

c. the dred scott v. sandford case,

brainliest is someone you pick by simply clicking a button. it only shows up if there are two people that answered your question, then you decide who answer more accurately with detail and explanation and you give that person the title "brainliest".

i hope this your understandings.