A nucleus of ${}_{92}^{238}U$ decays in stages by emitting ${\alpha ^ - }$particles and ${\beta ^ - }$ particles, eventually forming a nucleus of ${}_{82}^{206}Pb$
How many ${\alpha ^ - }$particles and how many ${\beta ^ - }$ particles are emitted during the decay chain?

A
2 )
B
3 )
C
4 )
D
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