Which of the following shows the emission of beta particle?
A. \({ }_{88}^{226} \mathrm{Ra} \rightarrow{ }_{86}^{222} \mathrm{Ra}+{ }_{2}^{4} \mathrm{He}\)
B. \({ }_{7}^{14} \mathrm{~N}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{8}^{17} \mathrm{O}+{ }_{1}^{1} \mathrm{H}\)
C. \({ }_{92}^{228} \mathrm{U}+{ }_{90}^{230} \mathrm{Th} \rightarrow 2_{4}^{2} \mathrm{He}+2_{-1}^{0} \mathrm{e}\)
D. \({ }_{84}^{210} \mathrm{Po} \rightarrow{ }_{82}^{206} \mathrm{~Pb}+{ }_{2}^{4} \mathrm{He}\)
Correct Answer: C
