The Main Drawback of Geothermal Energy Is That

Multiple Choice

The main drawback of geothermal energy is that:

A) heat- resistant pipe materials through which magma can be circulated are extremely expensive.
B) utilization of this energy is limited to currently or recently active plate margins and hot spots.
C) it may be used for heating, but is not a reliable source for production of electricity.
D) geothermal heat sources are buried beneath nearly impenetrable rock.