After Ben Sees His Mother Pour Some Juice from a Tall

After Ben sees his mother pour some juice from a tall, narrow glass into a short, wide glass, he complains that he wants the juice in the taller glass because it has more juice. Rather than considering both the height and width of the glass, it is likely that Ben is focusing only on the height, reflecting _____, and does not realize that his mother could easily pour the same juice back into the taller glass to return to the starting state, failing to grasp the idea of _____.

A) conservation; object permanence
B) object permanence; conservation
C) centration; reversibility
D) reversibility; centration