The adjective confident is commonly followed by the preposition of when expressing confidence in someone's ability or something. Therefore, the correct sentence is "She is confident of his ability to succeed."
She is confident _____ his ability to succeed.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.