Final answer:
The pronoun 'them' is the correct choice for completing the sentence, ensuring it matches the case and person for accuracy and clarity.
Explanation:
The correct pronoun to complete the sentence: The men were on the first row, and I sat behind them.
When choosing between 'him' and 'them', 'them' is the correct pronoun here as it refers to a group of people (men) in the third person and in the objective case.
It is essential to match pronouns in sentences to the correct case and person for clarity and grammatical correctness.
Learn more about English Pronouns here:
https://brainly.com/question/35031741
