Final answer:
Children aged three to four can notice if a friend is feeling frustrated.
Explanation:
True. Children aged three to four who have developed theory-of-mind (TOM) can recognize the emotions of others, including feeling frustrated. This cognitive milestone allows them to understand that others have thoughts, feelings, and beliefs distinct from their own.
Learn more about empathy and theory of mind development here:
https://brainly.com/question/36619066
