A child was shown an amount of water in a glass. The teacher poured the whole amount to a much taller and narrower glass and marked this glass as

A. The same amount was poured in a shorter and wider glass, marked glass

B. When asked which has more water, the child's answer was "Glass A". In what stage of cognitive development is the child and what is this ability called? A. concrete operational stage; conservation B. formal operational stage; deductive reasoning

C. sensorimotor stage; symbolic functions

D. pre-operational stage; centration