silt, pebbles, and clay. sand, rocks, and clay. humus, clay, and sand. clay, silt, and rocks.
I gave my students this multiple choice question: The best soil mixture for plant growth and drainage is

Only one answer is correct among these 4 choices:
- silt, pebbles, and clay.
- sand, rocks, and clay.
- humus, clay, and sand.
- clay, silt, and rocks.

Could you tell me which one is correct?

humus, clay, and sand.