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← HistoryWhich outcome results when Song Dynasty iron casting efficiency increases rapidly?
A)Gunpowder weapon manufacture expands quickly✓
B)Crossbow bolt production decreases substantially
C)Water wheel gears corrode more readily
D)Paper armor use rises noticeably
💡 Explanation
Increased iron production allowed scaling of military technology, so standardized cast iron components streamlined gunpowder weapon manufacture through economies of scale, rather than decreased bolt production, gear corrosion, or armor shifts because of iron's expanding availability.
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