Answer:
B) covalent and molecular
Step-by-step explanation:
Substances that have low melting points and poor electrical conductivity are typically covalent and molecular, meaning they are composed of molecules held together by covalent bonds and are not good conductors of electricity. Ionic substances, on the other hand, are composed of ions and are generally good conductors of electricity. Metallic substances are also generally good conductors of electricity and have relatively high melting points.