Consider the formation of X and X forming which occurs in two steps as shown below: 

(i) W + 2X → 2Y         ΔH° = +100 kJ

(ii) X + 2Y → 2Z         ΔH° = –60 kJ 

(iii) W + 3X → 2Z       ΔH° = ?

Select the Hess's law diagram that best depicts the individual reactions and the overall process.