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An element A decays into an element C by...

An element A decays into an element C by a two step process `A to B + ._2He^4` and `B to C + 2e^(-)` .Then,

A

`A` and `C` are isotopes

B

`A` and `C` are isobars

C

`A` and `B` are isotopes

D

`A` and `B` are isobars

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A
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