Final answer:
The correct form of the possessive in the sentence 'A years worth of hard work has finally paid off' is 'years''.
Explanation:
The correct form of the possessive for the underlined word in the sentence is years', as it shows possession of the worth by more than one year. In English, when showing possession with plurals, we add a lone apostrophe after the final -s.
Learn more about Possessive Forms in English here:
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