The best description of the melting point difference between salt and sugar is:
A. The ionic bonds in salt result in a higher melting point than the covalent bonds in sugar.
Salt (sodium chloride) is an ionic compound, and the ionic bonds between the positively charged sodium ions and negatively charged chloride ions are strong, resulting in a higher melting point. In contrast, sugar (sucrose) is a covalent compound, and the covalent bonds within sugar molecules are typically weaker than ionic bonds, leading to a lower melting point.