Final answer:
Three-year-old Riley is likely to respond to the question with simple sentences mentioning their name, preferred activities, and favorite foods, in line with typical language development and self-awareness at that age.
Step-by-step explanation:
When asked "Tell me about yourself," three-year-old Riley is most likely to mention basic personal details and preferences. Riley might say something like, "I'm Riley. I like playing with my trucks and eating spaghetti." This response would demonstrate Riley's stage of language development with the use of simple sentences and could reflect their hobbies or favorite foods, indicative of their emerging identity and preferences at this age.