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.  

explanation:

actually, not all representation was acceptable based on this little piece of article, in 1776, the second continental congress issued the declaration of independence, stating their specific grievances with the british monarchy and why they were going to create a separate government. after the colonies separated from the british monarchy and formed the united states of america, they had to answer some crucial questions: 1) if not a monarchy, what type of government was the united states going to have? 2) what kind of government was going to protect the people without violating their individual liberties?

it teaches readers about an interesting chinese custom and causes them to determine that the minister is trying to be polite