Answer:
The correct answer is - D. biological.
Step-by-step explanation:
Wheathering is the process of breaking of the rocks or soil. It can be of different types on the factors such as chemical wheathering, physical wheathering and biological wheathering.
When a seed fall on to on a rock surface its sprouts, push roots into cracks in the rock or concrete. As the roots of plants develop, they secrete weak acids that slowly dissolve rock around the roots.
It is a type of biological wheathering.