A child is shown two identical balls of clay, sees one of them rolled into a rod shape, and is then asked which ball contains more clay. This child is being tested for an understanding of _____________?

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A child is shown two identical balls of clay, sees one of them rolled into a rod shape, and is then asked which ball contains more clay. This child is being tested for an understanding of _____________?

A. object permanence
B. conservation of substance
C. the reversibility of actions
D. logical possibilities