A student prepares four separate \(100.0 \text{ mL}\) buffer solutions using a weak monoprotic acid, \(\text{HA}\) (\(\text{p}K_a = 5.00\)), and its conjugate base, \(\text{NaA}\). To each solution, the student adds \(0.0020 \text{ mol}\) of solid \(\text{NaOH}\) without causing a significant volume change, and records the resulting \(\text{pH}\) values in the table below.

Buffer	\([\text{HA}]\) (M)	\([\text{A}^-]\) (M)	Initial \(\text{pH}\)	Final \(\text{pH}\) after addition of \(0.0020 \text{ mol NaOH}\)
W	\(0.50\)	\(0.50\)	\(5.00\)	\(5.03\)
X	\(0.50\)	\(0.050\)	\(4.00\)	\(4.16\)
Y	\(0.10\)	\(0.10\)	\(5.00\)	\(5.18\)
Z	\(0.050\)	\(0.50\)	\(6.00\)	\(6.24\)

Based on the data, which of the following correctly ranks the buffer solutions from greatest to least buffer capacity against the added strong base, and provides the best justification?