A student conducts a series of tests on four pure, crystalline solid substances, labeled \(W\), \(X\), \(Y\), and \(Z\). The observations and experimental data are recorded in the table below.

Substance	Melting point (\(^\circ\text{C}\))	Electrical conductivity of solid	Electrical conductivity of molten liquid	Solubility in water
\(W\)	\(119\)	Nonconductor	Nonconductor	Insoluble
\(X\)	\(776\)	Nonconductor	Good conductor	Soluble
\(Y\)	\(1713\)	Nonconductor	Nonconductor	Insoluble
\(Z\)	\(660\)	Good conductor	Good conductor	Insoluble

Based on the data in the table, which of the following claims is best supported by the evidence?