Atomic mass number of an element is `232` and its atomic number is `90`. The end product of this radiaoctive element is an isotope of lead (atomic mass `208` and atomic number `82`.) The number of `alpha`-and `beta` -particles emitted are.
A. `alpha=3,beta=3`
B. `alpha=6,beta=4`
C. `alpha=6,beta=0`
D. `alpha=4,beta=6`
