Your nephew loves to read science fiction. He particularly likes works in which alternative worlds are described and he has begun writing his own story set in a world where good triumphs over evil, and cunning wins out over treachery. Your nephew is probably in the stage of cognitive development.

The answer is the formal operational stage.

Explanation:

During this stage, the fourth and last according to Piaget's structure of cognitive development, people begin to think logically. Another key feature is the development of abstract thought, which also involves creativity.

In the example, the child has developed the ability to imagine a world that's radically different from the real one; thinking about hypothetical situations are characteristic of the formal operational stage.

answer; foreign services officers;

stable food supply,social structure, government,religion,culture/art,technology and writing/language;