DeBeers controlled 80% of the diamond business through the mid 20th century. After other mines were discovered in Canada, Russia, and Australia ended DeBeers' monopoly and its control of the industry is now down to 40%. What was the impact on the diamond market when competition moved into the market? Question 28 options: a) DeBeers monopolistic power persisted with the same control. b) An increase in competition lead to greater innovation, more variety, and lower prices. c) Diamond prices would increase as they become less popular as more firms operate in the diamond market d) Not many companies decided to enter the market