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Option 4 : Mettle

'Metal' refers to a solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity. 'Melted' refers to
make or become liquefied by heating. 'Malted' means mixed with malt or a malt extract. 'Mettle' means courage in pain or adversity. Thus option 4 is the correct substitution for the given phrase.
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