A radioactive nucleus `` { }_{Z}^{ A } X `` undergoes spontaneous decay in the sequence
`` { }_{ Z }^{ A } X \rightarrow _{z-1} B \rightarrow _{Z -3} C \rightarrow _{Z -2} D `` , where `` Z `` is the atomic number of element `` X `` . The possible decay particles in the sequence are :
(A) `` \alpha, \beta^{-}, \beta^{+} ``
(B) `` \alpha, \beta^{+}, \beta^{-} ``
(C) `` \beta^{+}, \alpha, \beta^{-} ``
(D) `` \beta^{-}, \alpha, \beta^{+} ``