What is the approximate difference in elevation between Austin and the Hill Country just to the west?

The correct answer to this open question is the following.

The approximate difference in elevation between Austin and the Hill Country just to the west is about 1000 to 1,500 feet, depending on the city or location in the Texas Hill Country in Central Texas.

In this case, the elevation of Austin, the capital city of the state of Texas is 621 feet. If we compare its elevation with, let's say, Fredericksburg, that is close to Austin, Fredericksburg has an elevation of 1,685 feet. Other cities and towns that are part of the Texas Hill are Brady, Del Rio, Junction, and San Saba. These places are full of different kinds of vegetation and wildlife.

answer; /// i believe that the correct answer is (c)

i'll just take the points xd