C because it sounds more formal and like you know what you are talking about !
I think it’s d but correct me if I’m wrong
D. A complement
You could associate the "comple" in complement to "comple" in complete to help you remember.
Answer: "The (1846) crack" is what both sentences have in common, therefore we can combine them like this:
Since it could not be fixed, the Liberty Bell has had that crack in it ever since.
I think it can be d or c . I’m not sure though .
