Achild is presented with two identical balls of clay. the experimenter rolls one ball into a long, thin shape; the other remains in its original ball. the child is then asked if there is more clay in the ball or in the long, thin piece of clay. if the child answers the problem correctly the child most likely is in which stage of piaget’s cognitive development theory? select one:
a. sensorimotor stage
b. preoperational stage
c. formal operational stage
d. concrete operational stage

The concrete operational stage.

Explanation:

Piaget’s cognitive development theory is a type of comprehensive theory that check the human intelligence. This theory explains the ways by which the human acquire its intelligence.

The third stage of the cognitive theory is the concrete operational stage. This stage develops in the individual with 7 to 11 years of age. The individual is aware to known the use of logic in this stage. In this question the child is able to use its logic to tell the answer. Hence, he is in the  concrete operational stage.

Thus, the correct answer is option (D).