Ornstein and Associates Have Shown That a 7-Year-Old Will Rehearse

Ornstein and associates have shown that a 7-year-old will rehearse as effectively as a 12-year-old as long as the items the child must remember remain in sight.What do these results imply about the the source of the inefficient rehearsal that 7-year-olds normally display?

A) It results from a mediation deficiency.
B) It results from the physical limitations of the short-term store in young children.
C) It results from problems in retrieving items to form clusters.
D) It results from a lack of motivation to succeed when memory tasks are difficult.