In the sentence, identify the segment which contains the grammatical error. But in the corner, almost hidden from his fellows, a forty-years-old-man was sitting who did not enjoy the singing.

The grammatical error of the sentence is in option C. The numerical value, ‘forty’, mentioned in the sentence acts as an adjective to modify the noun ‘year’. Also, there is another noun, ‘man’, immediately after it. If there’s a numerical adjective with a noun, the plural of that noun can’t be used if there’s another noun following it. Moreover, the article ‘a’ has also been mentioned before it. Thus, replace “years” with “year” to make the sentence grammatically correct. Correct sentence: But in the corner, almost hidden from his fellows, a forty-year-old man was sitting who did not enjoy the singing.