What is the MAIN reason the author includes the section "Metallurgy"? (A) to explain the process used to extract metal from ore
(B) to describe a new fuel used in the process to remove metal from ore
(C) to show how people experimented with making metals
(D) to explain how changes in iron production led to new machines

Which of the following arguments decided the debate over using the atomic bomb against japan in 1945? using the bomb would destroy the armaments still available to japanese forces in japan. using the bomb would demonstrate the power of the united states to the entire world. using the bomb would shorten the war and avoid heavy casualties among invading troops. using the bomb would enable allied forces to invade and take over the japanese mainland