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

Question

( A ) Two $\beta^-$
( B ) Two $\beta^-$ and one $\beta+$
( C ) One $\beta^-$ and one $\gamma$
( D ) One $\beta^+$ and one $\beta^-$