The binding energies per nucleon for a deuteron and an particle are ${\mathrm{x}}_{1}$ and ${\mathrm{x}}_{2}$ respectively. What will be the energy Q released in the reaction ${}_{1}\mathrm{H}^{2}+{}_{1}\mathrm{H}^{2}\to {}_{2}\mathrm{He}^{4}+\mathrm{Q}$

(a) $4\left({\mathrm{x}}_{1}+{\mathrm{x}}_{2}\right)$             (b) $4\left({x}_{2}-{x}_{1}\right)$
(c) $2\left({\mathrm{x}}_{1}+{\mathrm{x}}_{2}\right)$             (d) $2\left({x}_{2}-{x}_{1}\right)$

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