"An OTA places a 6-month-old infant supine on the floor. When his head is turned to one side, the OTA observes that the infant's entire body turns in the direction of their head. What reflex is this infant demonstrating?"

A. Symmetric tonic neck (STNR)
B. Neck-righting (NOB)
C. Palmar grasp
D. Labyrinthine/optical (head) righting