A nucleus with Z = 92 emits the following in a sequence: \[\alpha ,\,{{\beta }^{-}},\,{{\beta }^{-}},\,\alpha ,\alpha ,\alpha ,\alpha ,\alpha ,{{\beta }^{-}},\,{{\beta }^{-}},\alpha ,\,{{\beta }^{+}},\,{{\beta }^{+}},\,\alpha \]. The Z of the resulting nucleus is [AIEEE 2003]

• A.            74  
• B.            76
• C.            78  
• D.            82