Study the given figure and label X,Y, and Z.
A. `{:(X,Y,Z),("Backword reaction","Forward reacton","Products"):}`
B. `{:(X,Y,Z),("Backword reaction","Forward reacton","Equilibrium"):}`
C. `{:(X,Y,Z),("Reversible reaction","Irreversible reacton","Equilibrium"):}`
D. `{:(X,Y,Z),("Forward reaction","Forward reaction","Backward reaction"):}`