The binding energy per nucleon for a deuteron and an $\alpha$-particle are $x_1$ and $x_2$ respectively. The energy $Q$ released in the following reaction is:
$_1H^2 + _1H^2 \rightarrow {_2}{He}^4 + Q$

  • A
    $4(x_2 - x_1)$
  • B
    $4(x_1 - x_2)$
  • C
    $2(x_1 - x_2)$
  • D
    $2(x_2 - x_1)$

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