A nucleus .n^mX emits one alpha particle...

A nucleus `._n^mX` emits one `alpha` particle and two `beta^-` particles .The resulting nucleus is

A

`._(n-4)^(m-6)Z`

B

`._n^(m-6)Z`

C

`._n^(m-4)X`

D

`._(n-2)^(m-4)Y`

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The correct Answer is:

C

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