Cameron counted a total of eight blocks stacked in a single pile of blocks. When the pile was knocked over and the blocks scattered in front of him, he knew that there were still eight blocks. This indicates that Cameron has reached the stage of development.
a. sensorimotor
b. concrete operational
c. preoperational
d. formal operational

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.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.

sounds good to me mate!