Phản ứng hạt nhân nào sau đây là quá trình phóng xạ

A. ${}_0{}^1\mathrm{n}+{}_{92}{}^{235}\mathrm{U}\to {}_{54}{}^{139}\mathrm{Xe}+{}_{38}{}^{95}\mathrm{Sr}+2{}_0{}^1\mathrm{n}$

B. ${}_{84}{}^{210}\mathrm{Po}\to {}_2{}^4\mathrm{He}+{}_{82}{}^{206}\mathrm{Pb}$

C. ${}_1{}^2\mathrm{H}+{}_1{}^3\mathrm{H}\to {}_2{}^4\mathrm{He}+{}_0{}^1\mathrm{n}$

D. ${}_0{}^1\mathrm{n}+{}_{92}{}^{235}\mathrm{U}\to {}_{56}{}^{144}\mathrm{Ba}+{}_{36}{}^{89}\mathrm{Kr}$