Final answer:
The relationship between civilization and nature is developed through Ralph's recollection of the children's fears (option b).
Step-by-step explanation:
The universal theme of the relationship between civilization and nature is developed in this passage through Ralph's recollection of the children's fears.
Ralph reflects on the challenges they have faced, such as the beastie, the snake, the fire, and the talk of fear, which have caused the breakdown of their initially happy and civilized society.
He emphasizes the need to confront and overcome fear in order to rebuild their civilization and find happiness again.