A copper specimen has resistivity equal to 1.8 x 10-8 ohm-m at roomtemperature.
At a temperature of 700 K, the resistivity is likely to be

1.6 x 10-8 Ω-m
 
2 x 10-8 Ω-m
 
3 x 10-8 Ω-m
 
6 x 10-8 Ω-m
 

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