Yulya, age 12, regularly asks questions such as, "What if everyone just got along?" and "If I became a medical researcher, could I find a cure for cancer?" According to Jean Piaget's theory, these questions suggest that Yulya has acquired the ability to

• A. mentally reverse actions.
• B. think symbolically.
• C. think abstractly.
• D. consider all relevant features of an object.

Answer: (C)