In water scarcity, which evidence would most convincingly support efficient irrigation?

• A. A description of ancient farming methods.
• B. A chart showing water loss due to evaporation.
• C. A case study of farms that reduced water use while maintaining yields.
• D. A list of irrigation equipment brands.

Answer: (C)

When judging evidence for efficient irrigation, the strongest proof comes from real-world results that show water use is reduced without sacrificing output. A case study of farms that cut water use while maintaining yields provides concrete, measurable outcomes—actual data on water savings and crop production—which demonstrates that efficient irrigation methods work in practice, across different settings, and can be scaled or replicated.

Why this matters is that it moves beyond theory or partial data. It shows a direct link between the irrigation practices employed (such as precise scheduling, soil moisture monitoring, or drip irrigation) and the desired outcome: less water used and steady or higher yields. This kind of evidence is persuasive because it reflects real farming conditions and outcomes.

The other options don’t provide that same level of convincing demonstration. Describing ancient farming methods doesn’t tell us whether those approaches are effective today. A chart of water loss due to evaporation highlights where water is wasted but doesn’t show successful, efficient use in practice. A list of irrigation equipment brands talks about products, not about how well irrigation actually performs in keeping yields with less water.