The isotope $^{222}_{86}\text{Rn}$ undergoes a chain of emissions to produce the isotope $^{206}_{82}\text{Pb}$. At each point in the decay chain, it releases either an $\alpha$-particle or a $\beta$-particle. How many stages are there in the decay sequence?
- A$4$
- B$8$
- C$16$
- D$20$