This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
All indicate criteria for "problem village" except 
Select and explain. 
A. Drinking water source is not within 1.6 km in plans, B. Drinking water source is not within 100 m elevation in hilly, C. Water is more than depth of 15 meters, D. High risk of water pollution
D: High risk of water pollution
Answer: D: High risk of water pollution 
Explanation: None