PLS HELP TEST IS TIMED!! The temperature of a solution can change the solubility of a substance. The chart shows the solubility of the same solute at different temperatures in water.

A 3-column table with 4 rows. The first column labeled solution has entries W, X, Y, Z. The second column labeled temperature degrees C has entries 40, 59, 55, 48. The third column labeled grams per 100 grams of water has entries 50, 200, 150, 80.

Based on the chart, which solution was at the optimal temperature to allow for the greatest solubility?