The final product,D,in the following reaction sequence 
, would be:
Definitions:
Concrete Operational
A stage in Jean Piaget's theory of cognitive development during which children (ages 7-12 approximately) gain a better understanding of mental operations, leading to more logical thoughts about concrete events.
Formal Operational
The stage of cognitive development, according to Piaget, where individuals can think abstractly and systematically.
Assimilation
The cognitive process of fitting new information into pre-existing cognitive schemas, perceptions, and understanding.
Accommodation
The process of adapting or adjusting one's cognitive structures to incorporate new information from the environment.
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