Tritium (³H)is Used in Glowing "EXIT" Signs Conveniently Located Where $\beta$

Tritium (³H) is used in glowing "EXIT" signs conveniently located where there is no electricity for lightbulbs.What decay route is likely for tritium?

A) " $\beta$ ^- emission"
B) " $\beta$ ^-emission"
C) " $\alpha$ emission"
D) " $\gamma$ emission"
E) "X-ray emission"