In his decades-long study of giftedness, Lewis Terman found

a. that there were surprisingly few professionals in his sample.
b. there were a great many professionals and even an "Einstein" or two.
c. that most gifted children generally grew up to be healthy and happy adults.
d. academic success was unrelated to IQ.
e. that high IQ was practically a guarantee of wealth and fame.

c. that most gifted children generally grew up to be healthy and happy adults.