Can’t catch my breath is an idiom figurative language. The term refers to a set expression or a phrase comprising of two or more words.
The top or extreame point of something
Washington D.c. Boston Chicago New York
C is correct i believe. its not A because that could not be a sentance byitself, not b because im sure you know why and d might be but then the teacher would be trying to explain to you something other then the rules of punctuation