The nuclide $^{222}_{86}\text{Rn}$ undergoes a chain of decays, step by step, until the nuclide $^{206}_{82}\text{Pb}$ is produced. In this decay chain, four of the nuclides that are produced emit $\alpha$-particles. All of the remaining nuclides emit $\beta$-particles. How many of the nuclides produced in the decay chain are $\beta$-particle emitters?
- A2
- B4
- C8
- D12