Three-Year-Old Lucretia Conducts an Experiment at Playtime

Three-year-old Lucretia conducts an experiment at playtime. Lucretia collects sand and then dumps it into a puddle of water. She mixes the sand and water until it is just the "right" consistency. Several times, Lucretia smashes and works the mixture between her hands and watches it ooze out. In no time, two other children have come over to Lucretia's mixture and put their hands in also. Next the three of them gather some sand toys and begin making cakes with the mixture. As they share their cakes, another child joins in. This is an example of

A) one-to-one correspondence.
B) logico-mathematical knowledge building.
C) webbing.
D) behavior contagion.