Covalent molecular crystals have very low melting points, while covalent network crystals have a very high melting point because
A. the forces that hold molecules together in molecular crystals are weaker than those that hold molecules or atoms together in network crystals
B. there are more molecules in molecular crystals than in network crystals
C. network crystals are more intricate crystals
D. molecular crystals can be either polar or nonpolar, while network crystals are always nonpolar
Answer: A