Your 3-year-old daughter, Noria, recently attended a birthday party, where she received a bag of colorful plastic toys. There were several animals, a few cars, and human figures. Noria asked whether she could play with her toys. After a few minutes, you noticed that she was putting them into groups (e. g., animals, cars, people, etc.). What cognitive ability would Piaget say Noria is demonstrating?

A. categorizing
B. memorizing
C. practicing fine motor skills
D. sorting