To determine the correct phrase to substitute the bold text in the sentence, "The long or short of it is that I do not want to deal with that new firm," we need to understand the idiomatic expression commonly used in English. The phrase "The long and short of it" is a well-known idiom signifying a summary or the gist of the matter.
Evaluating the options:
- The long and short of it: This is the correct idiomatic expression meaning a summary or the essence of something. It is grammatically correct and makes sense in the context of the sentence.
- The long and short for it
- The long or short for it
- No correction required
Since "The long and short of it" is the correct phrase, option (a) replaces the bold phrase to make the sentence grammatically correct. Therefore, the correct answer is "
The long and short of it".