In infants, the plantar grasp reflex should disappear by age:

Rationale: A. By 3 months, the plantar grasp reflex may still be present; disappearance occurs later. B. At 4 months, the reflex is gradually fading but not fully absent in all infants. C. The plantar grasp reflex, in which the infant curls the toes when the sole of the foot is stroked, typically disappears by around 8 months of age as voluntary control over the toes develops. D. By 12 months, the reflex is expected to be fully absent, and persistence beyond this age may indicate neurologic abnormalities.