Which Is the Most Correct Regarding the Current Discussion on Piaget's

Which is the most correct regarding the current discussion on Piaget's concept of the formal operational stage.

A) There is broad agreement that all individuals achieve formal operational thought, but the age at which this occurs varies.
B) Some researchers argue that the definition of formal operational thought should include intuitive reasoning and personal experience.
C) Some researchers suggest that personal experience is more useful than formal operational thinking.
D) Researchers question whether formal operational thought is universally achieved.
E) There is widespread agreement that Piaget was correct.