Discussion
We say that a child has achieved the skill of conservation when she knows that :
Answer: A
A child has achieved conservation when she knows that change in appearance of an object does not affect number/weight/volume.
In Piaget's theory, conservation is the understanding that a quantity stays the same when its shape or arrangement changes: water poured from a short wide glass into a tall thin one is still the same amount. It is attained in the concrete operational stage, from about seven years.
The other options describe the pre-operational error, that a change in appearance changes the quantity, or confuse the idea by making appearance part of volume and weight. Conservation means quantity is independent of appearance, not that weight and volume are independent of each other.
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