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) by age 4, children tended to use logical deduction
B) by age 7, children used spatial relationships
C) by age 10, trial-and-error strategies based on logic are used to balance the scale
D) by age 13 or 14, logic is used to understand a reciprocal relationship