A nucleus of uranium-238, $^{238}_{92}\text{U}$, undergoes a decay chain in successive stages to produce a nucleus of lead-206, $^{206}_{82}\text{Pb}$, as illustrated. $^{238}_{92}\text{U} \;\rightarrow\; \ldots\ldots\ldots\ldots\; \rightarrow\; ^{206}_{82}\text{Pb}$ In each stage, either an $\alpha$-particle or a $\beta^-$ particle is emitted. What is the overall number of $\beta^-$ particles emitted?
- A6
- B8
- C10
- D16