A.\(\varepsilon  = \left( {{m_p} + {m_n} - {m_X}} \right){c^2}\)
B.\(\varepsilon  = \left[ {Z{m_p} + \left( {A - Z} \right){m_n} - {m_X}} \right]{c^2}\)
C.\(\varepsilon  = \frac{{\left[ {Z{m_p} + \left( {A - Z} \right){m_n} - {m_X}} \right]{c^2}}}{Z}\)
D.\(\varepsilon  = \frac{{\left[ {Z{m_p} + \left( {A - Z} \right){m_n} - {m_X}} \right]{c^2}}}{{A - Z}}\)

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