A radioactive nucleus $^{220}_{86}\text{Rn}$ undergoes decay in two stages to form $^{212}_{82}\text{Pb}$. Which two particles are released in this sequence?
- Aan $\alpha$-particle and a $\beta$-particle
- Ban $\alpha$-particle and a proton
- Ctwo $\alpha$-particles
- Dtwo $\beta$-particles