Identify the series with decreasing order of water use efficiency.

Correct option is A

The correct order of water use efficiency from highest to lowest is:
1. Pitcher pot irrigation – Very efficient as water is slowly released near the root zone.
2. Drip irrigation – Delivers water directly to plant roots with minimal losses.
3. Sprinkler irrigation – More efficient than surface methods, but can lead to evaporation loss.
4. Surface irrigation – Least efficient due to percolation and runoff losses.