Contrast assimilation and accommodation. How are these two concepts different from one another? A. Piaget’s stages concentrated only on assimilation; Erickson focused solely on accommodation. B. Parents influence their children’s use of assimilation; parents cannot influence the act of accommodation. C. Piaget’s first stage of development involves only assimilation; his second stage involves only accommodation. D. Assimilation deals with current ways of thinking; accommodation causes a change in thinking.