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The binding energy per nucleon in deuterium and helium nuclei are 1.1MeV and 7.0M eV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is :

A. 23.6MeV
B. 2.2M eV
C. 28.0MeV
D. 30.2 MeV