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

An element `A` decays into element `C` by a two-step process :
`A rarr B + ._2 He^4`
`B rarr C + 2 e overline`
Then.

A

A and C are isotopes

B

A and C ae isobars

C

B and C are isotopes

D

A and B are isobars

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A
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