Studies in which Inhelder and Piaget’s classic tasks are administered to people of a variety of ages and backgrounds indicate that formal operational reasoning
a. is found consistently after age 15-16 (10th grade).
b. is found among the majority of adults but not teenagers.
c. is found mainly in areas where a person has developed considerable expertise.
d. is found only among highly trained scientists and philosophers.
Answer: c. is found mainly in areas where a person has developed considerable expertise
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