Step 1: Understanding the Concept:
Hay quality is determined by moisture content.
Excess moisture leads to spoilage.
Step 2: Key Formula or Approach:
No specific formula.
Need to know hay quality standards.
Step 3: Detailed Explanation:
Good quality hay should contain moisture not more than 30-35%.
This prevents mould growth.
Higher moisture (65-70%) is too high for hay.
Silage has 65-70% moisture.
Thus, the correct range is 30-35%.
Step 4: Final Answer:
Good quality hay should have moisture not more than 30-35%.
Hence, the correct option is (D).