Critical Reasoning (CR) | Astronomer: Among recently-observed stars, LV-426 has been exhibiting

Astronomer: Among recently-observed stars, LV-426 has been exhibiting signs of turbulent activity. Prior to this observation, scientists speculated over whether LV-426 could become a supernova, but dismissed the possibility since the star was dormant for a prolonged period of time. It now seems likely that LV-426 will explode into a supernova, since turbulent surges of activity have been observed in every star that has transformed into a supernova.

In the astronomers argument, which of the following