Read the text and answer the multiple-choice question by selecting the correct response. Only one response is correct.

Huge reserves of energy are found in rocks way below the surface of the bottom in Britain. it’s calculable that the north and southwest regions may hold enough energy within the kind of heat to supply power for various homes. In fact, up to a fifth of Britain’s energy might be provided by this energy supply. Extracting the warmth and changing it into electricity is tough and costly. Thousands of boreholes would be needed; however once they were in situ, the warmth would keep make indefinitely.

Q.What is the writer’s main purpose in this paragraph?

(A)to show how common the use of geothermal power is in Britain.
(B)to describe the problems related to using geothermal power in Britain.
(C)to highlight the potential benefits of geothermal power for Britain.
(D) to give a detailed description of how geothermal energy is produced in Britain.

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