To solve the problem, we need to systematically decode the terms based on the given renaming scheme. This is essentially a logical reasoning and mapping exercise.
1. Understand the renaming scheme:
- 'water' is called 'food'
- 'food' is called 'tree'
- 'tree' is called 'sky'
- 'sky' is called 'wall'
2. Identify where a 'fruit' grows:
Typically, a fruit grows on a 'tree'. According to the renaming scheme, we need to find what 'tree' is renamed to.
3. Map 'tree' to its new name:
According to the mapping, 'tree' is called 'sky'. Therefore, in this context, a 'fruit' grows on what is called 'sky'.
Thus, the correct answer is Sky.