Binding energy per nucleon versus mass number for W, X, Y,Z are indicated on the curveThe process that would release energy is:

W → 2YBinding energy of W = 7.5 × 120 = 900 MeVBinding energy of 2Y = 2(8.5 × 60) = 1020 MeVBinding energy (2Y) > Binding energy of (W).Thus, energy will be released