Entrainment refers to:

• A. Rhythms of speech being ingrained in the infant
• B. Synchronization of caregiver and infant cues
• C. Caregiver's ability to read infant cues
• D. Infants learning to recognize caregiver names

Answer: (A)

Entrainment is about the infant tuning to the rhythm of speech they hear from caregivers. Through repeated exposure to infant-directed speech, the infant’s perceptual systems align with the timing, cadence, and prosody of spoken language, effectively ingraining those rhythms. This rhythmic alignment helps the infant parse speech, anticipate sounds, and support early language development and social connection. While syncing caregiver and infant cues is related to social interaction, the focus of entrainment here is how the infant internalizes speech rhythms. The other options describe broader cue matching or later lexical skills (like recognizing names), which are not the core process of entrainment.