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Identify [A] and [B] in the following ...

Identify [A] and [B] in the following
`""_(89)^(227)Acoverset(-beta)rarr[A]overset(-alpha)rarr[B]overset(-alpha)rarrRn`

A

Po, Rn

B

Th,Po

C

Ra,Th

D

Th, Ra

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