A decay series starts with 90232Th{}^{232}_{90}\mathrm{Th}90232Th and ends with 82208Pb{}^{208}_{82}\mathrm{Pb}82208Pb. Only alpha and beta-minus decays change the mass and atomic numbers. How many of each decay occur?
666 alpha decays and 888 beta-minus decays
444 alpha decays and 666 beta-minus decays
888 alpha decays and 666 beta-minus decays
666 alpha decays and 444 beta-minus decays