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)?
A. Two `beta""^(-)`
B. Two `beta""^(-)` and one `beta""^(-)`
C. One `beta""^(-)` and one `gamma`
D. One `beta""^(+)` and one `beta""^(-)`
