Final answer:
12-month-old Trent is displaying object permanence when he looks at and points to where his stuffed bunny usually is, as this developmental milestone demonstrates the understanding that objects continue to exist even when out of sight.
Step-by-step explanation:
When 12-month-old Trent's dad asks him to get his stuffed bunny, and Trent looks at and points to the pillow where the bunny usually rests, Trent is displaying object permanence.
This cognitive development is part of the typical growth observed in infants around this age, as identified by psychologist Jean Piaget. Object permanence is the understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed.
This stage coincides with the emergence of other behaviors, such as searching for hidden objects, following simple commands with associated gestures, and demonstrating attachment and separation anxiety.