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The correct answer would be the second option. Copper will have the best electrical conductivity among the crystals given. It has the highest value among the choices which is 54.5 x 10^6 siemens/m. Water do not conduct electricity. Silicon dioxide, on the other hand, is a good insulator. 

Answer: Cu crystals would exhibit the best electrical conductivity.

Explanation: SiO2(silicon dioxide) is a molecular solid and it is an insulator. Water and methane are the non conductors of electricity.

Copper is a metal and its a good conductor of electricity. So, Cu would exhibit the best electrical conductivity.

Due to the best electrical conductivity, copper wires are widely used.

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