Step 1: Concept
Bench terracing is an extreme form of soil conservation used on very steep slopes (typically 16-33%).
Step 2: Meaning
It involves transforming the steep slope into a sequence of flat "steps" or platforms.
Step 3: Analysis
Each "step" acts as a separate flat field where crops can be grown safely without the water washing everything down the mountain.
Step 4: Conclusion
The land is divided into a series of flat platforms or pieces.
Final Answer: (D)