Given figure shows a plot of binding energy per nucleon E_b against the nuclear mass M . A, B, C,...

Given figure shows a plot of binding energy per nucleon E_b against the nuclear mass M . A, B, C, D, E, F correspond to different nuclei. Consider four reactions
(i) A+B → C+ε
(ii) C → A+B+ε
(iii) D+E → F+ε
(iv) F → D+E+ε
where ε is the energy released. In which reactions is ε positive?
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) and (iii)
(d) (i) and (iv)

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