Answer:
d. Conservation
Step-by-step explanation:
Piaget test for conservation focuses on The ability to understand that quantity remains the same even when appearance changes.
Piaget tested three types of conservation;
1. Number
2. Volume
3. Mass
The theory can be described as with this;
Piaget used children under the age of 7 and went ahead to show them 2 identical rows of six counters. These children. identified that there were an equal number of counters in each one. Then, one row was pushed together and these children was asked which had more. These children responded saying that there were fewer counters in the shorter row.