Fallen leaves from tree are useful because they
enrich soil fertility
The correct option is C:
Explanation of the correct option:
The explanation for the incorrect options:
Option A: only the fallen leaves are not enough to solve the problem of fuelwood and also when they are burned they produce a lot of smoke which is not good for the environment.
Option B: fallen leaves instead of enriching the water quality will make it poor.
Option D: fallen leaves do not beautify the landscape.
Final answer: Fallen leaves from the tree are useful because they enrich the soil fertility