The number of $\alpha$ and $\beta$ particles, respectively, emitted in the radioactive decay $ _{90}X^{200} \to _{80}Y^{168}$ are :

Question

( A ) $6 \alpha$ & $8 \beta$
( B ) $8 \alpha$ & $6 \beta$
( C ) $6 \alpha$ & $6 \beta$
( D ) $8 \alpha$ & $8 \beta$