Longitudinal Research by Tomlinson-Keasey and Colleagues on Concrete Operations Tasks

Multiple Choice

Longitudinal research by Tomlinson-Keasey and colleagues on concrete operations tasks has demonstrated that

A) conservation tasks are fully developed in the preschool years.
B) the concrete operations stage does not begin until age 8.
C) cognitive development occurs in spurts.
D) most conservation tasks do not develop until formal operations.
E) horizontal decolage occurs only in preoperational thoughts.