How does the author reveal the theme?

a) the construction and knocking down of the cardboard house help to convey the theme of our attraction to demolition
b) the number of activities going on at once contributes to the theme of the importance of new experience for children
c) the contrast between the active children and the calm daycare providers help develop a theme of the beauty of controlled chaos

b) the number of activities going on at once contributes to the theme of the importance of new experience for children