A. ${ }_{10}^{20} \mathrm{Ne} \rightarrow ?+{ }_{2}^{4} \mathrm{He}$ B. ${ }_{78}^{195} \mathrm{Pt} \rightarrow ?+{ }_{-1}^{0} \beta$ C. ${ }_{21}^{45} \mathrm{Sc} \rightarrow ?+{ }_{2}^{4} \mathrm{He}$ D. ${ }_{16}^{32} S \rightarrow ?+{ }_{-1}^{0} \beta$