A nucleus with Z = 92 emits the following in a sequence : $\alpha, \; \alpha, \; \beta^-, \; \beta^-,\; \alpha,\; \alpha,\; \alpha, \; \alpha; \; \beta^-,\; \beta^-,\; \alpha,\; \beta^+, \; \beta^+, \; \alpha$. The $Z$ of the resulting nucleus is :

Question

( A ) 76
( B ) 82
( C ) 78
( D ) 74