The problem in the italicized element in the sentence below is
The book was interesting.
o trite expression
slang
o colloquialism/stilted language
o vague language

the correct answer will be d or c for me it may be different

in general, fiction refers to plot, settings, and characters created from the imagination, while nonfiction refers to factual stories focused on actual events and people. however, the difference between these two genres is sometimes blurred, as the two often intersect.

explanation: