Which of the following is an example of pre-verbal communication?

Pre-verbal communication refers to the ways in which infants and young children communicate before they develop the ability to use words. This form of communication is characterized by gestures, facial expressions, and body language, which express emotions and intentions without verbal language.

Smiling and mimicking are key components of pre-verbal communication as they allow children to engage socially and express themselves before they can articulate their feelings or needs through speech. Smiling can indicate happiness or comfort, while mimicking can help children learn about social interactions and develop their understanding of communication dynamics.

The other choices represent more advanced levels of language development. Using single words to express needs indicates a transition into verbal communication. Forming simple sentences is a further step in language acquisition, demonstrating an understanding of grammar. Repeating words back signifies comprehension and a level of verbal interaction that goes beyond pre-verbal stages.