In the transformation of ${}_{92}^{238}U$ to ${}_{92}^{234}U$, if one emission is an α-particle, what should be the other emission(s)?

Question

Two $\beta^-$

Two $\beta^-$ and one $\beta^+$

One $\beta^-$ and one $\gamma$

One $\beta^+$ and One $\beta^-$

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