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A
change the amount of ore extracted.
B
store metals for long periods of time.
C
increase or decrease smelting and purification.
Explanation:
The flexibility in industrial metals life cycle primarily comes from the ability to increase or decrease smelting and purification (Option C). Here's why:
The ability to control smelting and purification rates allows producers to respond to price changes and market conditions more effectively than changing extraction rates or relying solely on storage.