Solid NaCl is a very poor conductor of electricity (ionic movement) because

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there are Na⁺ and Cl^- ions in the lattice

there are no free electrons in the molecule.

the oppositely charged ions are fixed in the lattice positions and strong electrostatic forces exist between them.

there are no free ions in the molecule

answer is A.

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Detailed Solution

NaCl (common salt) is solid in state and solid ions or compounds don't conduct electricity. It needs to be either melted, molten or dissolved in a solution (i.e. water) first. Only then will the electrons be free to move to either the Cathode (-ve) or to the Anode (+ve). In a liquid state the electrons are free enough to move.
Hence, solid NaCl is a bad conductor of electricity because its ions cannot move freely.

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