92U^239 decays emitting a beta-particle ...

`_92U^239` decays emitting a `beta`-particle producing neptunium nucleus, which further decays emitting a `beta`-particle and the daughter product is plutonium (Pu). The grand daughter product can be expressed as :

A

`_90Pu^239`

B

`_90Pu^241`

C

`_94Pu^239`

D

`_94Pu^241`.

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