Koorin evaluates a 10-month-old infant with delayed gross motor development. The examination reveals a symmetrical tonic neck reflex (STNR) that has not integrated. Which of the following activities will the infant MOST likely have difficulty performing?
A) Rolling from supine to prone while reaching across midline
B) Maintaining quadruped while performing reciprocal crawling movements
C) Maintaining unsupported sitting while reaching outside the base of support
D) Transitioning from supine to sitting through a sidelying position
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