Gilbert notices that his sausage is sliced into six pieces, whereas his brother's is sliced into nine pieces. he understands, however, that his brother's sausage is not actually any larger than his own. this indicates that gilbert has by now reached the:
a. concrete operational.
b. sensorimotor.
c. formal operational.
d. pre-operational.

Concrete operational stage

Explanation:

The concrete operational stage is the third and most important stage of Piaget's theory. This stage occurs between seven to eleven years. It is mid of childhood. This stage is characterized by the logical thinking of a child. The thinking is like concrete and start to think logically. At this stage, children to think logically but are struggling with abstract thinking. Children at this stage used inductive reasoning.  

Gilbert thinks that when his sausages sliced into six pieces and brother has nine slices. When he starts that his sausages are not less than his brother. It is an example of the concrete operational stage.  

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