​How Might an Investigator Test for the Concept of Conservation

Multiple Choice

​How might an investigator test for the concept of conservation?

A) Place a toy behind a barrier and see whether the child reaches around it to get the toy.
B) ​Ask a hypothetical question, such as "How could we move a mountain of whipped cream from one part of the city to another?"
C) ​Show the child two equal rows of coins and then spread out one row and ask whether the rows are still the same.
D) ​Demonstrate a way of playing with a toy, then give the child the toy and see whether he or she plays with it the same way.