Question 2
Solid sodium chloride does not conduct electricity, even though it is made entirely of ions. Why not?
The right answer is the one marked above.
Its ions are locked in the lattice and cannot move. A current is a flow of charge, so it needs charged particles that are free to travel — not merely present.
The ions are there all along and keep their charges; melting or dissolving does not create them, it only frees them. And a compound does not change from ionic to covalent when it solidifies.