The verb "attribute" takes the fixed preposition "to" (attribute something to a cause).
He attributed his failure in the examination ____ tough paper.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the Anti Narcotics Force (ANF) preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.