Which statement most accurately represents carnegie’s effect on the steel industry between 1865 and 1892? a-carnegie built a monopoly by remaining focused on iron ore and coke supplies. b-carnegie was reluctant to change production methods and processes. c-carnegie stayed with the pennsylvania railroad until he opened his own plant and started making steel. d-carnegie realized that steel was the metal of the future and began to invest in or buy up potential competitors. the answer is d