The verb "dismount" is followed by the preposition "from" when referring to getting off a horse, bicycle, or other vehicle. Therefore, "The king dismounted from his horse." is the correct sentence.
The king dismounted _____ his horse.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the Education Testing Council by HEC preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.