That the Robinson (black man) was accused of raping the Ewells daughter. Atticus plans to prove the court that it was not possible for Robinson to do the things he was accused of.
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.
Please show a picture so that I can help you
The second sentence is correct
