I would go with:
A theme is best written as statement because a theme is main thing of a story, the author could also use a statement in a story to make it seem more alive or more real.
I Hope my answer worked for you :)
Hey mate your answer is Sonnet
Hope it helps:)
Can you elaborate a little more please?
The theme about growing up conveys the complexity of the adult world in which you can no longer remain innocent as a child in order to survive.