Morris, age 4, is having lunch with his mother and sister. When his mother pours the milk that is left in the carton into the children's glasses, she finds that there is not enough to fill both glasses, so she carefully pours half of the milk in the shorter, fatter glass in front of Morris and half into a slender, taller glass in front of Morris's sister. Immediately, Morris complains that his sister got more milk than he did, and even when his mother tries to explain that they both got the same amount, Morris insists he is right. In this example, Morris is demonstrating a lack of development in the area of __________.
A. egocentrism
B. conservation
C. concrete operational thought
D. post-abstract thought
Answer: B
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