Read the sentences and choose the option that best arranges them in a logical order.
A. To help control this runoff and to generate hydroelectric power, the Lower Colorado River Authority operates a series of dams that form the Texas Highland Lakes.
B. The eastern part of the city is relatively flat, whereas the western part and western suburbs consist of scenic rolling hills on the edge of the Texas Hill Country.
C. The city is also situated on the Balcones Fault, which, in much of Austin, runs roughly the same route as Loop 1 (Mopac Expressway).
D. The lakes also provide venues for boating, swimming, and other forms of recreation within several parks located on the lake shores.
E. Because the hills to the west are primarily limestone rock with a thin covering of topsoil, portions of the city are frequently subjected to flash floods from the runoff caused by thunderstorms.