the figure shows the plot of binding energy per nucleon as a function of mass number A. the letters A B C D and E represent the positions of typical nuclei on the curve. point out giving reason the two process one of which can occur due to nuclear fission and the other due to nuclear fusion.

Dear Student ,
The nuclei at A and B can undergo nuclear fusion as their binding energy per nucleon is small and as they are less stable so they will fuse with other nuclei to become stable .
The nuclei at E can undergo fission as its binding energy per nucleon is large and hence it will split in to two or more lighter nuclei and become stable .
Regards