A student compares the dissolution of the hypothetical ionic solids \(\text{MZ(s)}\) and \(\text{NZ(s)}\) in water.

\[ \text{MZ(s)} \rightarrow \text{M}^{+}\text{(aq)}+\text{Z}^{-}\text{(aq)} \]

\[ \text{NZ(s)} \rightarrow \text{N}^{+}\text{(aq)}+\text{Z}^{-}\text{(aq)} \]

For \(1\text{ mol}\) of each solid, the lattice-separation enthalpies are equal, and the hydration contributions from \(\text{Z}^{-}\) are identical. In the diagram, the first-shell hydration radius is the distance from the center of a cation to the center of a surrounding water oxygen atom.

Based on the particulate diagram, which statement correctly compares the cation hydration enthalpies and the enthalpies of solution?