Compound Y has a melting point of 110 °C, is insoluble in water, and does not conduct electricity in either the solid or liquid state. Which statement is most consistent with these observations?
a) Y is composed of ions arranged in a three-dimensional lattice.
b) Y is a polar molecular solid whose molecules are held together by hydrogen bonding.
c) Y consists of nonpolar molecules held together by London dispersion forces.
d) Y contains a network of covalently bonded atoms extending in three dimensions.