D. seems the most probable since plastic is barely biodegradable.
Loamy soil is ideal for gardening because it contains c-mostly sand with very little clay or silt.
Loamy soil is good for gardening since this soil can retain water and nutrient, but if the water is too much it still can be drained away. The soil contains mostly sand which was bigger particle than silt and clay.
I would say D because mechanical weathering is the breaking up of rocks by physical forces
The answer to this question would be A:growth factors
Hope this helped!!
I think I’ll go with C. long dry cold winters
