Final answer:
A three-year-old should be able to concentrate on a single activity for 2-3 minutes.
Step-by-step explanation:
A three-year-old should be able to concentrate on a single activity for 2-3 minutes. At this age, their attention span is still developing, and it is normal for them to have short bursts of focus before becoming easily distracted or moving on to something else.
Learn more about Attention span in young children