The correct option is C C
Let’s examine the sentence: “The question papers were not unfortunately sent in time.” The sentence labels the whole event of the question papers not being sent in time as unfortunate. Hence, the adverb “unfortunately” needs to be moved right at the beginning of the sentence. So, the correct sentence would be, “Unfortunately, the question papers were not sent in time.” So, the error is in Part C of the sentence. Hence, Option C is the correct answer.