Nucleus X is radioactive and transforms into nucleus Y by decay. X and Y are isotopes of the same element. Which set of particles could have been released during the decay process?
- A$1\ \alpha$-particle and $1\ \beta^{-}$ particle
- B$1\ \alpha$-particle and $2\ \beta^{-}$ particles
- C$2\ \alpha$-particles and $1\ \beta^{-}$ particle
- D$2\ \alpha$-particles and $2\ \beta^{-}$ particles