The main implication of the rainfall-variability graph is

• A. Climate variability is fixed.
• B. Regions with high variability need adaptive water management.
• C. Droughts will disappear with current practices.
• D. Rainfall is uniform across years.

Answer: (B)

Rainfall-variability graphs show how rainfall can swing from year to year, not just the average amount. When a region exhibits high variability, its water supply becomes unpredictable, which raises the risk of droughts in dry years and floods in wet years. The practical takeaway is that such areas need adaptive, flexible water management—things like storage to save surplus when rain is abundant, diversified water sources, responsive irrigation practices, and plans that can adjust to different conditions. The other statements don’t fit because variability isn’t fixed, droughts aren’t guaranteed to disappear with current practices, and rainfall isn’t uniform across years.