Final answer:
The correct developmental sequence for motor skills in infants is crawling, followed by walking, and then running. This progression from 1) Crawl, Walk, Run is observed as infants develop into toddlers, typically mastering walking by their first birthday and running by the age of three.
Step-by-step explanation:
The sequence of development in motor skills during infancy typically occurs in an orderly pattern. Infants must first gain control over their head and neck muscles, then develop the ability to sit unassisted, before moving on to crawling. Once crawling is mastered, they then progress to walking. Running follows as the next stage of motor development, usually after walking skills have become more stable.
In terms of the options provided for the sequence of development, the correct order developmentally is 1) Crawl, Walk, Run. This sequence aligns with standard developmental milestones observed in infants as they grow into toddlers. By their first birthday, most toddlers have started to walk and by age three, many of them can run and climb stairs confidently.