"Crawling down the stairs" is a gerund phrase. It is a phrase that functions as a noun, with the gerund "crawling" (the '-ing' form of the verb) acting as the subject of the sentence.
Crawling down the stairs is dangerous for babies. (Here Crawling Down The Stairs is an example of)
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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.