HELP ASAP In regards to the number of firms, which of the following is the best example of an oligopoly?
A. one firm producing 95 percent of the output
B. eight to ten firms producing 60 percent to 70 percent of the output
C. two to four firms producing 70 percent to 80 percent of the output
D. ten or more firms producing 90 percent of the output

How did the invention of the cotton gin affect slave labor in the united states? a. there was a forced migration of slaves from the south to the north. b. slave-owning cotton planters were gradually forced to sell their plantations. c. more slaves were purchased to work on cotton plantations in the south. d. the reduced need for labor on cotton plantations led to a decline in slavery. e. slaves were moved from cotton plantations to sugar plantations.