Let's analyze the given data step by step:
1. We have four regions: Rocky Mountains, Great Plains, Sierra Nevada Mountains, and Atlantic coast.
2. We know the annual mean precipitation ranges for these regions in 2000.
Here are the precipitation ranges for each region:
- Rocky Mountains: 5.01-12.00 inches
- Great Plains: 12.01-20.00 inches
- Sierra Nevada Mountains: >100.00 inches
- Atlantic coast: 30.01-50.00 inches
To determine which region received the most overall precipitation, we need to focus on the upper bounds of these ranges:
- Rocky Mountains: 12.00 inches
- Great Plains: 20.00 inches
- Sierra Nevada Mountains: >100.00 inches (indicating well over 100 inches)
- Atlantic coast: 50.00 inches
Based on these values, the region with the highest upper bound of precipitation is the Sierra Nevada Mountains with more than 100 inches. Therefore, the region that received the most overall precipitation in 2000 is:
C. Sierra Nevada Mountains