The word that best completes the sentence is that or who. The complete sentence is: "Man is the only animal that can think in a positive way about the progress of mankind" or "Man is the only animal who can think in a positive way about the progress of mankind". Both "that" and "who" are relative pronouns that can be used to refer to a person or a thing, but "who" is generally preferred for people, while "that" is often used for animals or things in general statements.
Man is the only animal ______ can think in a positive way about the progress of mankind.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.