According to the passage, which of the following is true about the development of steam power? A. The steam engine's basic technology can be traced back to medieval Britain when steam-powered machinery was being tried in farming activities. B. Although Russia and Britain developed steam-power technology simultaneously, Britain was first to try it in a large-scale industry due to a greater need for iron. C. Steam-power technology was largely the result of improvements developed to increase the supply of coal as a primary source of energy. D. Adaptations to steam engines required for their use in cotton-spinning mills led to radical developments in machinery used in the iron industry.