Step 1: Understanding the Concept:
Agro-ecological regions are classified based on climate, soil, and physiography.
ICAR has classified India into agro-ecological regions.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the classification by ICAR.
Step 3: Detailed Explanation:
ICAR has divided India into 15 agro-ecological regions.
These are based on soil types, climate, and cropping patterns.
Earlier there were 20 and 8 classifications, but 15 is the current standard.
Thus, there are 15 agro-ecological regions in India.
Step 4: Final Answer:
There are 15 agro-ecological regions in India.
Hence, the correct option is (B).