In the given reaction\[_{z}{{X}^{A}}{{\to }_{z+1}}{{Y}^{A}}{{\to }_{z-1}}{{K}^{A-4}}{{\to }_{z-1}}{{K}^{A-4}}\]Radioactive radiations are emitted in the sequence [AIIMS 1982; CBSE PMT 1993; AFMC 1999; MP PET 2002]

• A.            \[\frac{2{{\varepsilon }_{0}}hc}{{{e}^{2}}}\]              
• B.            \[\beta ,\ \alpha ,\ \gamma \]
• C.            \[\gamma ,\ \alpha ,\ \beta \]                                         
• D.            \[\beta ,\ \gamma ,\ \alpha \]