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

1. A
   Two ${\beta }^{-}$
2. B
   Two ${\beta }^{-}$ and one ${\beta }^{+}$
3. C
   One ${\beta }^{-}$ and one $\gamma$
4. D
   One ${\beta }^{+}$ and one ${\beta }^{-}$