Which statement best provides evidence that the substance is a mutagen

The cells change after being exposed to the chemical, and this change is passed to the next generation of cells.

2%? i tried finding the exact sorry if it's not 100% correct ; -;

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong