Answer:
The answer is b. concrete operational.
Explanation:
This is the third stage in Piaget's structure of cognitive development. It is characterised by the apparition of logical thinking. However, children during this stage still present a "rigid" perspective that makes it difficult to visualise abstract concepts or hypothetical situations.
In the example, Cameron has developed the ability to recognise the concept of conservation, a major feature of the concrete operational stage. This means a child is able to realise that the change in form or distribution of an object does not change the object itself.
