Step 1: Concept
Emitters (or drippers) are the discharge units used in drip irrigation systems to provide a slow, localized supply of water.
Step 2: Meaning
The defining characteristic of drip irrigation is its very low application rate.
Step 3: Analysis
Standard emitters are designed to release water in drops or tiny streams. While some specialized emitters go lower, the typical commercial range is between 2 and 19 liters per hour (LPH).
Step 4: Conclusion
Range (B) correctly identifies this standard operational discharge.
Final Answer: (B)