What does the author imply about alternative energy sources ?
A.Many different types of alternative energy sources exist.
B.Most alternative energy sources are too impractical for private use.
C.Solar and geothermal energy are the effective forms of alternative power.
D.Alternative energy is too expensive for developing countries to produce.
A.Many different types of alternative energy sources exist.
B.Most alternative energy sources are too impractical for private use.
C.Solar and geothermal energy are the effective forms of alternative power.
D.Alternative energy is too expensive for developing countries to produce.
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