In the following question, a sentence is given with a phrase highlighted in bold. Select the option given below that can replace the phrase in bold to make the sentence grammatically and contextually correct and mark that as your answer. If the sentence is correct as it is, mark 'no improvement required', as the answer She immersed herself in the complexity off devouring books from various genres to expand her knowledge and imagination.

(a) The phrase "the complexity off" doesn't convey the intended meaning, so far, the rest of the sentence is concerned. Replacing "off" with "of" would have made the sentence meaningful implying that she immersed herself in the complex task of devouring (reading) books from various genres. Among the given options, only (a) is a good fit because it describes the broad scope of books and reading that she's diving into. Hence, (a) is the correct answer. The final sentence: She immersed herself in the world of literature devouring books from various genres to expand her knowledge and imagination. The phrase that will replace the highlighted phrase must contain a noun to denote what the subject immersed herself in. Option (d) does not have any such noun. Option (b) makes the sentence contextually incorrect as lack of understanding would not lead one to read books of many genres. Option (c) is incorrect as the there is an error in preposition "from". The preposition "for" would better connect someone's passion and the object of passion.