Rejecting the null hypothesis when it should have been accepted, causes the

Which is the first period in which Piaget would expect children to understand that changing the shape of a ball of clay from a pancake shape to a ball does not change the amount of clay there is?

a. sensorimotor period b. preoperational period c. concrete operations period d. formal operations period

Jeff observed a quick succession of cars moving together on the road. His first thought was that they were all a part of a convoy of some sort. Which law of perceptual organization best explains Jeff's assumption?

A) The law of unity B) The law of similarity C) The law of continuity D) The law of common fate