Sharday is a one-year old infant. One day while she was in h…

Sharday is a one-year old infant. One day while she was in her crib, she kicked her leg and was surprised the movement caused her mobile to make a sound like a wind chime. Sharday repeatedly kicked her leg to see if the mobile would chime again. Over time, Sharday refined her ‘kicking’ scheme. According to Piaget, Sharday’s behavior is an example of a: