C. You have absolutely no way of knowing where the chip came from. Take it on the chin, chalk it up to experience, etc etc. They all pick up dings eventually. I remember being heartbroken when my gorgeous Shuker got its first tiny ding, through a stupid moment of clumsiness at home, and I beat myself up about it for some time. But then I looked at it philosophically and realised that Sh*t Happens, it would've happened sooner or later anyway. The two or three it's picked up since have been met with some choice Anglo-Saxon vernacular but that's all.