How do simple molecular lattices behave in terms of conductivity?

Simple molecular lattices, such as those found in substances like ice or solid carbon dioxide, are made up of molecules held together by weak intermolecular forces, such as van der Waals forces or hydrogen bonds. These forces allow the molecules to remain in fixed positions within the lattice structure.

In their solid state, these molecular lattices do not have free-moving charged particles or ions. This lack of charged particles means that they cannot conduct electricity. When considering their behavior when melted or dissolved in a solvent, simple molecular substances also do not produce ions, further reinforcing their inability to conduct electricity.

Thus, the correct choice emphasizes that simple molecular lattices lack the necessary charged carriers to enable the movement of electric current, leading to their classification as insulators in all states of matter.