The question requires us to choose, among the options given, which compound would present the highest boiling point.
We can analyze the boiling point of the substances given by comparing the type of bonding they present. To boil a substance means transform it from its liquid state to a gas state, thus the molecules will be separated during this process. If the bonding type present is veyr strong, such as an ionic bond, more energy will be necessary to boil the substance.
We can rank the type of bonds from lowest to highest boiling points as: non-polar covalent < polar covalent < ionic bond (this rank is based on the strength of these types of bonds)
Now, considering the compounds given, only NaCl present ionic bond, therefore it must present the highest boiling point among the options given. A simple way to determine the ionic bond in NaCl is observe the atoms involved: it is a metal (Na) and a non-metal (Cl), which is a characteristic of ionic compounds.
Therefore, the best option to answer this question is the first one, NaCl.