Choose the correct part of the sentence. I have written a novel, because literature is my

The idiom "bread and butter" refers to one's main source of income. Therefore, if literature is the reason for writing a novel, it implies it's the author's primary focus or livelihood. The other options, "hot potato" (a controversial issue) and "bad egg" (a dishonest person), do not fit the context of pursuing literature as a passion or profession.

The correct completion is: bread and butter.