Sean Finds That When He Tries to Learn Algebra by Himself

Sean finds that when he tries to learn algebra by himself it is impossible. However, when he works with his tutor, algebra seems so much easier-she gradually gets him to understand the material by himself. According to Vygotsky's theory, Sean is able to master algebra because of the concept of

A) guided participation.
B) abstract thinking.
C) situated cognition.
D) socially shared cognition.