Which Educational Theorists Are Primarily Responsible for the Constructivist Model

Multiple Choice

Which educational theorists are primarily responsible for the constructivist model and the concept attainment method, respectively?

A) Piaget and Bruner.
B) van Hiele and Piaget.
C) Skinner and Piaget.
D) Bruner and Gagne.
E) Piaget developed both of these.