Correct Answer: Option C
Explanation:
Correct form is 'twenty-year-old' with hyphens. Without the final hyphen, it might still be accepted, but usually 'a twenty-year-old son'. So 'twenty-year-old' is hyphenated. The option has 'twenty-year old', missing a hyphen. So error at 'twenty-year' if not fully hyphenated. I'll say no error in colloquial writing, but standard exam expects 'a twenty-year-old son'. So error is that it should be 'twenty-year-old'. So 'twenty-year' is incomplete. I'll mark B.
This question belongs to:
English
Nouns
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