Match the Definition to the Term

Match the definition to the term.
-zone of proximal development (ZPD)

A) concept that describes the difference between what a person is intellectually ca-pable of on his or her own and what is possible with the mild guidance from someone who is more capable
B) four major sequential steps between infancy and late adolescence,each one in-volving the acquisition of new strategies and ways of thinking that permit the so-lution of previously unsolvable problems
C) term for three ways of conceptualizing,or mentally representing,material being taught which parallel the Piagetian stages of cognitive development
D) the observation that over the past century,as new revisions of intelligence tests have been developed,subjects have been getting "smarter" (as measured by aver-age performance on intelligence test items) at an impressively steady rate
E) theory that the performance of all intellectual tasks requires both a single common factor,called general intelligence (g) ,and a second,specific factor (s) which is unique to the task