When Piaget and Inhelder Asked Children of Different Ages to Balance

When Piaget and Inhelder asked children of different ages to balance a scale using several different weights, they found that:

A) preschool children tended to use logical deduction.
B) 7-year-old children used spatial relationships.
C) by age 10, children used trial-and-error strategies.
D) adolescents failed to see the complexities of the problem.