Which of the Following Best Describes Robert Sternberg's Unique Contribution

Which of the following best describes Robert Sternberg's unique contribution to the discussion of the basis for intelligence?

A) He was the first person to identify of two main forms of intelligence: crystallized and fluid.
B) He argued that model of multiple intelligences hindered the objective study of intelligence.
C) He was against traditional tests of intelligence because they were not sensitive to domain specific intelligence.
D) He was the first to expand the definition of intelligence to include the ability to adapt to real-world, cultural environments.
E) He was the first individual to develop a standardized measure for assessing intellectual functioning in children.