Question 211 of 239

The above is 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) $A+B \rightarrow C+\varepsilon$
(ii) $\mathrm{C} \rightarrow \mathrm{A}+\mathrm{B}+\varepsilon$
(iii) $\mathrm{D}+\mathrm{E} \rightarrow \mathrm{F}+\varepsilon$ and
(iv) $F \rightarrow D+E+\varepsilon$ where $\varepsilon$ is the energy released? In which reactions is $\varepsilon$ positive?