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Which of the following reactions is an example of a beta-plus decay?

A

$_{3}^{6}\textrm{Li}\rightarrow \ _{2}^{4}\textrm{He}+_{1}^{2}\textrm{H}$

B

$_{55}^{137}\textrm{Cs}\rightarrow \ _{56}^{137}\textrm{Ba}+_{-1}^{0}\textrm{e}$

C

$_{53}^{131}\textrm{I}\rightarrow \ _{54}^{131}\textrm{Xe}+_{-1}^{0}\textrm{e}$

D

$_{11}^{22}\textrm{Na}\rightarrow \ _{10}^{22}\textrm{Ne}+_{1}^{0}\textrm{e}$

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