10. The area of the state with the highest elevation is a. the mountains of eastern Oklahoma. a. the Panhandle and Black Mesa. c. the Arbuckle Mountain area. d. the Wichita Mountain area.

To determine the area of the state with the highest elevation among the options provided, we need to analyze each option based on geographical knowledge of Oklahoma: 1. **Mountains of Eastern Oklahoma**: This area includes the Ozark Mountains, but they are not the highest elevation in the state. 2. **Panhandle and Black Mesa**: The Black Mesa is the highest point in Oklahoma, reaching an elevation of 4,973 feet. 3. **Arbuckle Mountain Area**: This area has notable elevations but does not reach the heights of the Black Mesa. 4. **Wichita Mountain Area**: This area has significant elevations as well, but again, it does not surpass the Black Mesa. Based on this analysis, the area with the highest elevation is: **b. the Panhandle and Black Mesa.**