Final answer:
Plastic has high resistivity and is an insulator, which means it does not allow electric charges to move through it freely, unlike conductors.
Step-by-step explanation:
The correct statement that describes plastic is that it has a high resistivity and prevents charges from moving freely. Plastic, being an insulator, does not allow the charge carriers, which are the electrons, to move through it easily. In contrast, conductors like metals and salty water have free electrons or ions that can move relatively freely, allowing charges to move easily through them.