Correct Answer: Option D

Explanation

Sodium hydroxide (NaOH) is a strong base that reacts with several common metals, making them unsuitable for storage. Copper is the correct choice because it does not react with sodium hydroxide under normal conditions. 

Copper is a non-amphoteric metal and is relatively low in the electrochemical series, meaning it does not displace hydrogen from the base or form soluble complexes with the hydroxide ion.

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