Sodium conducts electricity because:

it is soluble in water

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it has only one electron in the outermost orbit

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it has mobile electrons

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it is an alkali metal

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Solution

The correct option is B it has mobile electrons
Sodium is a good conductor of electricity at all states because its molecular structure consists of a lattice of positive ions encompassed by a sea of delocalised electrons, which can carry a charge and are mobile, electric charges can flow through sodium easily via electrons.
Hence, option $(C)$ is correct answer.

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