Which of the following is the most accurate statement based on research on formal operational thinking?  a. Educational background is unlikely to impact performance on Piagetian tasks.  b. Once people...

Which of the following is the most accurate statement based on research on formal operational thinking?

 a. Educational background is unlikely to impact performance on Piagetian tasks.

 b. Once people obtain formal operational thinking skills, they use them consistently across all tasks and situations.

 c. All people reach the formal operational stage of cognitive development by age 12.

 d. The way that formal operational thinking is manifested is likely different across different cultures.