B. Their , would be the correct answer, it makes the most sense .
The correct answer must be C - what you did when you realized you broke it. This is the case because you're looking for /evidence/, so clearly D and A are not the answer. B seems plausible, but the narrative is about /how/ you broke your arm, so B is ultimately not the best answer.
Hope this helps.
I forgot the name of this story, what was it?
The 4th one down. Hope this helped!
